True or False

1.An association is a description of a group of links with common behaviors and semantics.

2.An association is a logical construct, of which a reference is a generalization alternative.

3.Multiplicity specifies the number of instances of one object.

4.An association class is an association that is also a class.

5.An association class may have attributes, operation and participant in associations.

6.A qualified association is an association in which the objects in a “many” generalization are partially disambiguated by a qualifier.

7.Generalization is an important construct for both conceptual modeling and implementation.

8.To build complex systems, the developer must abstract different views of the system, build models using precise notations.

9.When analysts construct a model of the application, the detail implementation information will need to be considered.

10.The model has two dimensions – a view of a system and a stage of development.   

OPPORTUNITIES FOR CRITICAL THINKING

1.

Explain market segmentation.

2.

Define culture and give two examples of culture in the workplace.

3.

Explain the difference between high-touch and low-touch environments.

4.

What variables should be considered when developing a customer service strategy?

5.

Look for examples of infrastructure in your own organization.

6.

Contrast the potential success of a strategy that is developed according to the guidelines for creating a strategy and one that is not.

7.

Identify some customer service market segments that you are in.

8.

Give examples of situations where high-touch and low-touch environments are appropriate.

9.

What role do customers’ expectations play in the establishment of customer service strategy?

10.

Examine the culture of your own workplace.

3. Think of an example of a value chain activity that is sensitive to scale economies and one which is not. Critically discuss the reason for this difference. (130 words)

Hi there, I have put up the full sheet but it is question two that I need answered the most. Thank you for your time.

Question 1.

Drunk driving is one of the main causes of car accidents. Interviews with drunk drivers who were involved in accidents and survived revealed that one of the main problems is that drivers do not realise that they are impaired, thinking “I only had 1-2 drinks … I am OK to drive.” A sample of 5 drivers was chosen, and their reaction times (seconds) in an obstacle course were measured before and after drinking two beers. The purpose of this study was to check whether drivers are impaired after drinking two beers. Below is the data gathered from this study:

Driver 1 2 3 4 5

Before 6.15 2.86 4.55 3.94 4.19

After 6.85 4.78 5.57 4.01 5.72

1. The two measurements are dependent. Explain why. [1 mark]

2. Provide an estimate of the mean difference in reaction times between the two measurements. [4 marks]

3. Calculate and interpret a 95% confidence interval for the mean difference in reaction times between the two measurements. [15 marks]

4. Use a 5% level of significance and the following points to test the claim that reaction times before drinking two bears is lower than reaction times after drinking two bears.

(a) State the null and alternative hypotheses in symbolic form and in context.

(b) Calculate the test statistic.

(c) Identify the rejection region(s).

(d) Clearly state your conclusions (in context). [4 marks each]

5. What would the conclusion be if using a 1% level of significance? Justify your answer. [4 marks]

Question 2

This is part 2, this is the part that I need answered. Thank you for your time.

It was believed from the experiment on the obstacle course, in Part I, that there is a relationship between a subject’s reaction time before drinking two beers and the subject’s age:

Driver 1 2 3 4 5

Age (years) 20 30 25 27 26

1. What type of study is being outlined here? Justify your answer. [2 marks]

2. Plot a graph representing the relationship between reaction times before drinking two beers and age. [5 marks]

3. From the graph in Q2, suggest a relationship that could exist between the two measurements. [2 marks]

4. Use a 1% level of significance and the following points to test the claim that there is a relationship between the reaction times before drinking two beers and age.

(a) State the null and alternative hypotheses in context. [3 marks]

(b) Calculate the test statistic. [8 marks]

(c) Identify the rejection region(s). [4 marks]

(d) Clearly state your conclusions (in context). [4 marks]

5. What percentage of variation in reaction times before drinking two beers is unexplained by the relationship between reaction times before drinking two beers and age? [2 marks]

6. Derive a model/equation that could be used to predict reaction times before drinking two beers for a person, if the age of the person is known. [8 marks]

7. Using the model derived in Q6, what would the predicted reaction time, in the obstacle course, before drinking two beers of a 22-year-old be? [2 marks

The restaurant owner Lobster Jack wants to find out what the peak demand periods are, during the hours of operation, in order to be better prepared to serve his customers. He thinks that, on average, 60% of the daily customers come between 6:00pm and 8:59pm (equally distributed in that time) and the remaining 40% of customers come at other times during the operating hours (again equally distributed). He wants to verify if that is true or not, so he asked his staff to write down during one week the number of customers that come into the restaurant at a given hour each day. His staff gave him the following data:

Help the manager figure out if his instincts are correct or not. Use a Chi-Squared test to see if the observed distribution is similar to the expected. Use the average demand for a given time as your observed value.

Part 1:

What is the p-value of your Chi-Square test?

Parts 2:

The owner now wants you to help him analyze his sales data. The restaurant is famous for its Lobo lobster roll. You were given some information based on which you deduced that the demand for the lobster roll was normally distributed with a mean of 220 and standard deviation of 50. You also know that the lobster supplier can provide lobster at a rate that mimics a uniform distribution between 170 and 300. One Lobster is used per roll and the lobsters need to be fresh (i.e. the restaurant can only use the lobsters that are delivered that day).

You decide to run 200 simulations of 1000 days each.

1. Calculate the expected sales of Lobster roll per day based on your simulation results. I solved

201

2. Use the expected sales from each of your 200 simulations to create a confidence interval for the average expected sales. What is the 95% confidence interval, L (Your confidence interval is mean +/- L), for this estimate?

Periodic Inventory by Three Methods; Cost of Merchandise Sold

The units of an item available for sale during the year were as follows:

There are 80 units of the item in the physical inventory at December 31. The periodic inventory system is used.

Determine the inventory cost and the cost of merchandise sold by three methods. Round interim calculations to one decimal and final answers to the nearest whole dollar.

do you think the U.S. government should increase the minimum wage every year to match inflation? (your answer should be at least one paragraph)

A 175 g mass attached to a horizontal spring oscillates at a frequency of 2.80 Hz. At t =0s, the mass is at x= 7.00 cm and has vx =− 35.0 cm/s . Determine:

The maximum speed.

The maximum acceleration.

The total energy.

The position at t= 2.80 s .

In the previous parts, the following was found: period = 0.357 s, angular frequency = 17.59 rad/s, amplitude = 7.277 cm, phase constant = 15.8679 degrees.

A block of mass m = 2.6kg is attached to a single spring of spring constant k = 4.4Nmand allowed to oscillate on a horizontal, frictionless surface while restricted to move in the x-direction. The equilibrium position of the block is x=0m. At time t=0s the mass is at position x=2.7m and moving with x-component of velocity vx=−6.8ms. What is the x-component of velocity at time t=1.3s? Answer in meters per second.