Questions
1. When Michael Oher arrived at Briarcrest Christian, he hadvery little in the way of...

1. When Michael Oher arrived at Briarcrest Christian, he had very little in the way of education. What in his life failed him the most? His mother? The educational system?

Social services? Himself? What was the biggest obstacle to his success? What could have he done differently in his childhood -- if anything -- to avoid the educational and social void in which he found himself?

2. Before coming to Briarcrest, Michael Oher had no traditional support network, yet a number of people did help him out -- by letting him sleep on their floors, bringing him to

Briarcrest Christian, allowing him to enroll in the school, etc. Why did they help him?

3. Leigh Anne Tuohy took Michael Oher in and embraced him as her son, despite his different background and race. Given similar circumstances, would you do the same?

4. Leigh Anne takes in a boy who is homeless and helps him to be a success. In doing so she has to face criticism from her friends. Why do you think her friends were so quick to criticize? How would you have handled that situation? Do you think it is important to help those that are less well-off then you? Why?

5. Teachers at Briarcrest discovered that Michael Oher was not “stupid”, but rather had trouble learning in a classroom. What does that mean?   Are there any things that you find difficult learning in a “standard” environment?

6. What do you think of the fact that Michael Oher was allowed to take tests orally rather than written ones? Should schools make exceptions for students who have unique issues? Briarcrest Christian is a private school -- would a public school have the resources to operate as Briarcrest Christian did in Michael Oher’s situation?

7. Michael Oher’s success story was made possible, in part, because he had a talent for playing football. What if his talent had been for playing piano, or cooking, or building

furniture? Would he still have been able to rise out of poverty? Why or why not? Do disadvantaged kids who are good at sports have more opportunities than kids who

don’t, and if yes, is that fair -- or just fortuitous?

8. The Tuohys were criticized by people who thought that they must have been using Michael Oher for some purpose. Do you think they were? What was their motivation?

9. Michael Oher was adopted by a rich family and suddenly touted as one of the top football prospects in the country. Yet by all accounts, he remained grounded. What was most responsible for keeping him that way?

In: Psychology

Brand A   Brand B 3,202   3,792 3,135   3,653 3,131   3,649 3,202   3,702 3,256   3,748 3,260   3,686...

Brand A   Brand B
3,202   3,792
3,135   3,653
3,131   3,649
3,202   3,702
3,256   3,748
3,260   3,686
3,255   3,693
3,234   3,666
3,088   3,666
3,130   3,646
3,113   3,723
3,132   3,696
3,114   3,700
3,090   3,652
3,115   3,743
3,073   3,697
3,116   3,660
3,098   3,668
3,156   3,720
3,143   3,641
3,140   3,628
3,153   3,699
3,133   3,691
3,098   3,704
3,088   3,658
3,191   3,683
3,187   3,693
3,114   3,684
3,175   3,687
3,157   3,711
3,112   3,682
3,190   3,726
3,147   3,665
3,173   3,703
3,164   3,754
3,123   3,715
3,145   3,709
3,151   3,729
3,157   3,751
3,154   3,774
3,169   3,757
3,178   3,732
3,215   3,639
3,165   3,705
3,169   3,745
3,133   3,733
3,082   3,718
3,104   3,710
3,141   3,703
3,134   3,734
3,164   3,742
3,159   3,737
3,119   3,727
3,040   3,642
3,196   3,684
3,154   3,698
3,145   3,683
3,172   3,694
3,130   3,688
3,154   3,686
3,199   3,717
3,184   3,690
3,196   3,676
3,134   3,614
3,177   3,667
3,189   3,647
3,184   3,666
3,150   3,678
3,172   3,680
3,147   3,679
3,138
3,173
3,109
3,116
3,146

Studies conducted by the manufacturer of two different brands of asphalt shingles have shown product weight to be a major factor in the​ customer's perception of quality. The accompanying table shows the weight​ (in pounds) from a sample of 75 pallets of brand A shingles and 70 pallets of brand B shingles. Complete parts​ (a) through​ (e) below.

a. For the brand A​ shingles, is there evidence at the .01 level of significance that the population weight is different from 3,140 pounds?

Determine the Null Hypothesis H0 And the alternative hypothesis, H1

Determine the test statistic

Determine the P-Value

State the conclusion.

b. Interpret the meaning of the p-value in (a). Select the correct choice below and fill in the answer boy to complete your choice.

(Rounding to one decimal place)

A. There is a _% chance the null hypothesis is true.

B. If the population mean weight is in fact 3,140 pounds, there is a _% chance of observing a sample of 75 pallets that will yield a test statistic more extreme than the test statistic for this sample.

C. There is a _% chance that the alternative hypothesis is true

D. If the population mean weight is in fact not equal to 3,140, there is a _% chance of observing a sample of 75 pallets that will yield a test statistic more extreme then the test statistic in this sample.

c. For the brand B Shingles is there evidence at the .01 level of significance that the population mean weight is different from the 3,680 pounds?

Determine the Null Hypothesis H0 And the alternative hypothesis, H1

Determine the test statistic

Determine the P-Value

State the conclusion.

d. Interpret the meaning of the​ p-value in​ (b). round to 1 decimal place.

e. In (a) Through (d) do you have to be concerned with the normality assumption? Explain

In: Statistics and Probability

The Kissing Bug Josh couldn't believe how much he had learned during his summer volunteer program...

The Kissing Bug

Josh couldn't believe how much he had learned during his summer volunteer program working in a village clinic in northern Brazil. Even after completing his first year of medical school, Josh was shocked to learn about infectious disease morbidity in this underdeveloped region. He recalled his first appointment of the morning:

Teresa had traveled a long distance to bring her 6-year-old son, Marco, to the clinic. She was very worried because the boy was feverish and irritable but had also suffered from diarrhea and a severely swollen eye for more than a week (see the Figure). Josh was asking Teresa about any recent eye injuries Marco might have sustained as he carefully examined the swelling and struggled to connect the symptoms and make a diagnosis.

Overhearing this conversation, Dr. Thomas stepped into the examining area to assist. He showed Josh several tiny marks near Marco's lips and said, “When you see Romaña's sign, the characteristic swelling around one eye, you'll often find tiny bites around the lips. Marco is in the acute phase of Chagas disease.”

“You mean he's been bitten by the kissing bug,” Josh replied. “I do see the tiny marks now that you've pointed them out. But what is the connection with Romaña's sign?”

Dr. Thomas explained Marco's condition to Teresa and gave her a 30-day supply of nifurtimox with strict instructions to dose Marco four times every day and return to the clinic for a follow-up appointment. “Josh, you need to tell Teresa why it is so important to give Marco the medicine.”

Struggling to translate, Josh told Teresa that Marco's symptoms would eventually disappear on their own, but the microorganism would remain and cause serious damage that would show up in 10 to 20 years when the chronic phase of the infection begins. The only way to prevent this is to take the medicine as directed now. Josh warned Teresa that even though the nifurtimox could cause some unpleasant side effects in Marco, it was very important for her to continue giving the medication according to the directions.

4.  To what long-term damage does Josh refer?

5.  INVESTIGATE: What are the side effects of nifurtimox? Why can they be more problematic in children than adults?

Before they left the clinic, Dr. Thomas also gave Teresa two spray cans of a pyrethroid insecticide with instructions to spray the cracks and crevices in their mud hut once a week.

6.  Why did Dr. Thomas give Teresa insecticide spray?

Please help me understand and answer questions 4,5,6, in detail, thank you

In: Nursing

Mr Derrick Asumadu Danso has been in employment at KNUST IDL ACF Limited since 1st April...

  1. Mr Derrick Asumadu Danso has been in employment at KNUST IDL ACF Limited since 1st April 2014 as Financial Controller on a salary scale of GH¢ 12,000 × GH¢ 6,000.00 – GH¢ 60,000.

His service conditions include the following:

  1. Provision of a well-furnished bungalow in respect of which he pays GH¢100 per month as rent by way of deduction at source.
  2. Provision of a Land Cruiser Prado Vehicle with driver and fuel for both official and private purposes
  3. Special retirement package by way of a provident fund of which he contributes 7% of his basic salary, while the company tops it up with 8.5%.
  4. Social Security & National Insurance Trust contribution of 7%

His Returns submitted to Ghana Revenue Authority (GRA) on 16th March, 2018 in respect of 2017 Year of Assessment show the following unconsolidated allowances and benefits:

  1. Responsibility allowance of GH¢800 per month for which the company pays him cash.
  2. Utilities allowance per annum, GH¢2,400
  3. Risk allowance of 15% on basic salary and car maintenance allowance of GH¢1,200 for the year.
  4. Leave allowance of GH¢1,800 per annum.
  5. Watchman and a garden boy on salary of GH¢300 and GH¢350 per month respectively.
  6. Medical allowance per year GH¢2,400.
  7. Meals allowance of GH¢550 per month.
  8. Two house helps on GH¢380 wages per month. The amount is paid to Mr. Danso in cash directly by the company.
  9. Bonus of 40% of annual basic salary.
  10. Monthly Overtime allowance of GH¢140
  11. Unaccountable Entertainment allowance of GH¢800 a year.

Additional Information

  1. On 1st January, 2017 he was given a car loan of GH¢ 10,000 to purchase a car for his wife at a simple interest rate of 15.0% per annum. The institution gives similar facility to any other customer at the rate of 28% but the statutory rate (Bank of Ghana Rate) is 25.0%. The loan is to be paid within the period of 24 months.
  2. He is married with five (5) children, three (3) of whom are in SHS, the rest are working.
  3. He is also responsible for the upkeep of four (4) aged relatives of his.
  4. He is currently pursuing a Master of Science degree in Accounting at KNUST where he incurred GH¢ 13,000 by way of educational expenses in 2017
  5. He withdrew GH¢ 10,500 from his provident fund to buy a house in Kumasi in 2017
  6. His December, 2017 salary was paid on 2nd January 2018. However all allowances which are unconsolidated were paid in full during 2017 except those tied to the basic salary.

Required

  1. Calculate his chargeable income for the 2017 Year of Assessment
  2. Compute his tax liability for 2017 Year of Assessment

In: Accounting

Workshop 5 Background: In December 2017, 9-year old Jack and his mother (Harriet) were visiting their...

Workshop 5

Background: In December 2017, 9-year old Jack and his mother (Harriet) were visiting their extended family in Melbourne. They were shopping in the city on 21 December when a driver drove his car into pedestrians at the corner of Flinders and Elizabeth streets. Jack and his mum witnessed this event (in which 18 people were injured, with an elderly man subsequently dying from his injuries). They were not in harm’s way (with the car travelling away from them and the driver quickly apprehended. However, Jack and his mum had multiple conversations about how they each thought they could have been killed during the attack. Two days later, Jack and his mum returned to their home in Brisbane.

Jack lives in an intact family consisting of his biological parents, Harriet and Peter, and his older sister Natalie. He is in Grade 4 at the local primary school and has lots of friends. He is also close to his parents and his grandparents (who are involved in his care during the week).

Immediately following his return home, Jack experienced nightmares on a few occasions about cars driving towards him. After the first nightmare, Jack’s dad (who has a history of anxiety and depression) encouraged Jack to sleep in the parents’ bedroom on a camp mattress. Despite mum’s suggestion that it is time for Jack to move back to his own bedroom, he is still sleeping in his parents’ room. Jack’s mum and dad have had many arguments about this situation. Peter’s (dad) perspective is that:

·       Jack is a very sensitive child who (even as a newborn baby) is more easily upset than other children;

·       Jack has been exposed to a traumatic experience in which he could have been killed;

·       Loving support (including avoidance of going into Brisbane city) is required to prevent Jack from developing ongoing mental health problems following this exposure; and

·       He (dad) could not cope if he lost one of his children.

From Harriet’s (mum) perspective:

·       The experience was upsetting but she and Jack were not hurt and were never likely to have been hurt (as she has discussed with Jack);

·       Peter (dad) needs to talk about the attack less; and

·       Jack is a healthy boy who seems to be handling the experience well.

Question: How likely do you think it is that Jack might develop a diagnosable mental health problem following his exposure to the attack in Melbourne? [Note, you are not being asked to identify possible mental health problems]. Identify 8 factors (a mixture of risk and protective factors – does not need to be 4 of each; but rather 8 in total) to justify your answer, and explain why each is either  a risk or a protective factor.

In: Psychology

Frank Pulley was the General Manager of Fred Arnold’s, “Arnold’s Moving and Storage”, a family-owned business....

Frank Pulley was the General Manager of Fred Arnold’s, “Arnold’s Moving and Storage”, a family-owned business. He had been with the company since he got out of high school. He worked summers and vacations to make money during his college years. The company had grown as did Frank. When Frank graduated from college with his degree in business management, he was given the job of Office Accounts Manager. He managed the money for the business. During the evening, Frank went to school and received his MBA in Finance. By then, Arnold’s had expanded to include long distance moving as well as office moves in the Mid-Atlantic area. The company was making over $3,000,000 in sales and was growing at a rate of 8% -10 % a year. Competition was strong in the Mid-Atlantic region so Fred wanted to expand southward. About this time, Fred’s son decided it was time to come back into the business. He had been working in IT in Miami. He liked Miami and felt he could work from there and bring the business down the Eastern Seaboard.

Frank had been with the business for 12 years now and felt that with Fred’s son now back in the business, it might be time to leave. Fred saw Frank at lunch one day shortly after Frank started looking for a new job. “Frank, I just heard that you are looking for a senior management position. In fact, I had to hear it from Janice Jeppy of all people. I ran into her at the bank. She says you applied to Jeppy Movers for a job and was wondering why you would want to switch moving companies. I am wondering too. Don’t you want to stay with us?”

Frank was surprised. The thought had never occurred to him. He assumed that Mr. Arnold’s son and daughter would take over the business. Both of Fred’s children had been working in the business since they were in high school. “I don’t want to leave Mr. Arnold,” Frank replied, “but I assumed that with Frank back in the business, he would take over. I just couldn’t see where there was room for advancement.” Fred was afraid this is what the boy would say. His son was bright and showed promise, but Fred knew they needed experienced people like Frank to keep the company moving forward. Frank was great support for the business and would be the best support that he and his son could have. Fred wondered how he could keep Frank in the business. “Come see me tomorrow at 10 a.m., Frank and we will talk. I can’t let you go to Jeppy Movers, can I”?

What Can Fred Arnold do to keep Frank now and in the future? Include in the discussion how the growth of the company will affect Fred’s ideas.

Also, address succession and Frank’s role in the business going forward.

In: Operations Management

Learning Activity #1 Frank Pulley was the General Manager of Fred Arnold’s, “Arnold’s Moving and Storage”,...

Learning Activity #1

Frank Pulley was the General Manager of Fred Arnold’s, “Arnold’s Moving and Storage”, a family-owned business. He had been with the company since he got out of high school. He worked summers and vacations to make money during his college years. The company had grown as did Frank. When Frank graduated from college with his degree in business management, he was given the job of Office Accounts Manager. He managed the money for the business. During the evening, Frank went to school and received his MBA in Finance. By then, Arnold’s had expanded to include long distance moving as well as office moves in the Mid-Atlantic area. The company was making over $3,000,000 in sales and was growing at a rate of 8% -10 % a year. Competition was strong in the Mid-Atlantic region so Fred wanted to expand southward. About this time, Fred’s son decided it was time to come back into the business. He had been working in IT in Miami. He liked Miami and felt he could work from there and bring the business down the Eastern Seaboard.

Frank had been with the business for 12 years now and felt that with Fred’s son now back in the business, it might be time to leave. Fred saw Frank at lunch one day shortly after Frank started looking for a new job. “Frank, I just heard that you are looking for a senior management position. In fact, I had to hear it from Janice Jeppy of all people. I ran into her at the bank. She says you applied to Jeppy Movers for a job and was wondering why you would want to switch moving companies. I am wondering too. Don’t you want to stay with us?”

Frank was surprised. The thought had never occurred to him. He assumed that Mr. Arnold’s son and daughter would take over the business. Both of Fred’s children had been working in the business since they were in high school. “I don’t want to leave Mr. Arnold,” Frank replied, “but I assumed that with Frank back in the business, he would take over. I just couldn’t see where there was room for advancement.” Fred was afraid this is what the boy would say. His son was bright and showed promise, but Fred knew they needed experienced people like Frank to keep the company moving forward. Frank was great support for the business and would be the best support that he and his son could have. Fred wondered how he could keep Frank in the business. “Come see me tomorrow at 10 a.m., Frank and we will talk. I can’t let you go to Jeppy Movers, can I”?

Learning Activity #2

How might Arnold’s son attempt to engage the business in the Miami community to solidify the company’s move southward?

Explain how small businesses and community support is important to business sustainability?

In: Operations Management

ASSIGNMENT: Write a program and use the attached file (babynames.txt) as input file, and create two...

ASSIGNMENT: Write a program and use the attached file (babynames.txt) as input file, and create two output tiles. One file listing out all boys names, and the other file listing out all girls name.

CODE: (teacher gave some of the code below use it to find the answer please String B is the boy names String E is girl names)

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;

/**
This program reads a file with numbers, and writes the numbers to another
file, lined up in a column and followed by their total.
*/
public class Total
{
public static void main(String[] args) throws FileNotFoundException
{
// Prompt for the input and output file names

Scanner console = new Scanner(System.in);
System.out.print("Input file: ");
String inputFileName = console.next();
System.out.print("Output file1: ");
String outputFileName1 = console.next();
System.out.print("Output file2: ");
String outputFileName2 = console.next();

// Construct the Scanner and PrintWriter objects for reading and writing

File inputFile = new File(inputFileName);
Scanner in = new Scanner("babynames.txt");
PrintWriter out1 = new PrintWriter("boysnames.txt");
PrintWriter out2 = new PrintWriter("girlsnames.txt");

// Read the input and write the output

double total = 0;
  
  
while (in.hasNextLine())
{
String A = in.next();
String B = in.next();
String C = in.next();
String D = in.next();
String E = in.next();
String F = in.next();
String G = in.next();


out.printf("%15.2f\n", value);
total = total + value;
}

out.printf("Total: %8.2f\n", total);

in.close();
out.close();
  
}
}

babynames.txt:

1 Michael 462085 2.2506 Jessica 302962 1.5436
2 Christopher 361250 1.7595 Ashley 301702 1.5372
3 Matthew 351477 1.7119 Emily 237133 1.2082
4 Joshua 328955 1.6022 Sarah 224000 1.1413
5 Jacob 298016 1.4515 Samantha 223913 1.1408
6 Nicholas 275222 1.3405 Amanda 190901 0.9726
7 Andrew 272600 1.3277 Brittany 190779 0.9720
8 Daniel 271734 1.3235 Elizabeth 172383 0.8783
9 Tyler 262218 1.2771 Taylor 168977 0.8609
10 Joseph 260365 1.2681 Megan 160312 0.8168
11 Brandon 259299 1.2629 Hannah 158647 0.8083
12 David 253193 1.2332 Kayla 155844 0.7940
13 James 244775 1.1922 Lauren 153530 0.7822
14 Ryan 241105 1.1743 Stephanie 149725 0.7628
15 John 239730 1.1676 Rachel 148907 0.7587
16 Zachary 225188 1.0968 Jennifer 147948 0.7538
17 Justin 220012 1.0716 Nicole 136033 0.6931
18 William 217588 1.0598 Alexis 131117 0.6680
19 Anthony 216088 1.0525 Victoria 117386 0.5981
20 Robert 205313 1.0000 Amber 115551 0.5887

In: Computer Science

ASSIGNMENT: Write a program and use the attached file (babynames.txt) as input file, and create two...

ASSIGNMENT: Write a program and use the attached file (babynames.txt) as input file, and create two output tiles. One file listing out all boys names, and the other file listing out all girls name.

CODE: (teacher gave some of the code below use it to find the answer please String B is the boy names String E is girl names)

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;

/**
This program reads a file with numbers, and writes the numbers to another
file, lined up in a column and followed by their total.
*/
public class Total
{
public static void main(String[] args) throws FileNotFoundException
{
// Prompt for the input and output file names

Scanner console = new Scanner(System.in);
System.out.print("Input file: ");
String inputFileName = console.next();
System.out.print("Output file1: ");
String outputFileName1 = console.next();
System.out.print("Output file2: ");
String outputFileName2 = console.next();

// Construct the Scanner and PrintWriter objects for reading and writing

File inputFile = new File(inputFileName);
Scanner in = new Scanner("babynames.txt");
PrintWriter out1 = new PrintWriter("boysnames.txt");
PrintWriter out2 = new PrintWriter("girlsnames.txt");

// Read the input and write the output

double total = 0;
  
  
while (in.hasNextLine())
{
String A = in.next();
String B = in.next();
String C = in.next();
String D = in.next();
String E = in.next();
String F = in.next();
String G = in.next();


out.printf("%15.2f\n", value);
total = total + value;
}

out.printf("Total: %8.2f\n", total);

in.close();
out.close();
  
}
}

babynames.txt:

1 Michael 462085 2.2506 Jessica 302962 1.5436
2 Christopher 361250 1.7595 Ashley 301702 1.5372
3 Matthew 351477 1.7119 Emily 237133 1.2082
4 Joshua 328955 1.6022 Sarah 224000 1.1413
5 Jacob 298016 1.4515 Samantha 223913 1.1408
6 Nicholas 275222 1.3405 Amanda 190901 0.9726
7 Andrew 272600 1.3277 Brittany 190779 0.9720
8 Daniel 271734 1.3235 Elizabeth 172383 0.8783
9 Tyler 262218 1.2771 Taylor 168977 0.8609
10 Joseph 260365 1.2681 Megan 160312 0.8168
11 Brandon 259299 1.2629 Hannah 158647 0.8083
12 David 253193 1.2332 Kayla 155844 0.7940
13 James 244775 1.1922 Lauren 153530 0.7822
14 Ryan 241105 1.1743 Stephanie 149725 0.7628
15 John 239730 1.1676 Rachel 148907 0.7587
16 Zachary 225188 1.0968 Jennifer 147948 0.7538
17 Justin 220012 1.0716 Nicole 136033 0.6931
18 William 217588 1.0598 Alexis 131117 0.6680
19 Anthony 216088 1.0525 Victoria 117386 0.5981
20 Robert 205313 1.0000 Amber 115551 0.5887

In: Computer Science

Alan has a PAP with the following coverages: Liability coverages: $100,000/$300,000/$50,000 Medical payments coverage: $5,000 each...

Alan has a PAP with the following coverages: Liability coverages: $100,000/$300,000/$50,000 Medical payments coverage: $5,000 each person Uninsured motorists coverage: $25,000 each person Collision loss: $250 deductible
Other-than-collision loss: $100 deductible
With respect to each of the following situations, indi- cate whether the loss is covered and the amount pay- able, if any, under the policy. Assume that each situation is a separate event.


a. Alan’s son, age 16, is driving a family car, runs a red light, and kills a pedestrian. The family of the deceased pedestrian sues and damages are awarded in the amount of $500,000.
b. Alan borrows a friend’s car to go to the supermar- ket. He fails to stop at a red light and negligently smashes into another motorist. The other driver’s car, valued at $15,000, is totally destroyed. In addi- tion, repairs to the friend’s car are $5,000.
c. Alan’sdaughter,Heather,attendscollegeinanother state and drives a family auto. Heather lets her boy- friend drive the car, and he negligently injures another motorist. The boyfriend is sued for $50,000.
d. Alan’s wife is driving a family car in a snowstorm. She loses control of the car on an icy street and smashes into the foundation of a house. The prop- erty damage to the house is $30,000. The damage to the family car is $8,000. Alan’s wife has medical expenses of $5,000.
e. Alan is walking across a street and is struck by a motorist who fails to stop. He has bodily injuries in the amount of $15,000.

f. Alan’s car is being repaired for faulty brakes. While road testing the car, a mechanic injures another motorist and is sued for $50,000.

g. Alan’s car hits a cow crossing a highway. The cost of repairing the car is $2,500.

h. Athiefbreaksacarwindowandstealsacameraand golf clubs locked in the car. It will cost $400 to replace the damaged window. The stolen property is valued at $500.

i. Alan’s wife goes shopping at a supermarket. When she returns, she finds that the left rear fender has been damaged by another driver who did not leave a name. The cost of repairing the car is $2,000.

j. Alan works for a construction company. While driv- ing a large cement truck, he negligently injures another motorist. The injured motorist sues Alan for $25,000.

k. Alan’s son drives a family car on a date. He gets drunk, so his girlfriend drives him home. The girl- friend negligently injures another motorist, who has bodily injuries in the amount of $200,000.

l. Compact discs (CDs) valued at $500 are stolen from Alan’s car. The car was locked when the theft occurred. m. While driving a rented golf cart, Alan accidentally injures another golfer with the cart.

In: Operations Management