Required information

[The following information applies to the questions displayed below.]
  
In 2018, the Westgate Construction Company entered into a contract to construct a road for Santa Clara County for $10,000,000. The road was completed in 2020. Information related to the contract is as follows:

Westgate recognizes revenue over time according to percentage of completion.

rev: 09_15_2017_QC_CS-99734

5. Calculate the amount of revenue and gross profit (loss) to be recognized in each of the three years assuming the following costs incurred and costs to complete information. (Do not round intermediate calculations and round your final answers to the nearest whole dollar amount. Loss amounts should be indicated with a minus sign.)

Required information

[The following information applies to the questions displayed below.]
  
In 2018, the Westgate Construction Company entered into a contract to construct a road for Santa Clara County for $10,000,000. The road was completed in 2020. Information related to the contract is as follows:

Westgate recognizes revenue over time according to percentage of completion.

rev: 09_15_2017_QC_CS-99734

4. Calculate the amount of revenue and gross profit (loss) to be recognized in each of the three years assuming the following costs incurred and costs to complete information. (Do not round intermediate calculations and round your final answers to the nearest whole dollar amount. Loss amounts should be indicated with a minus sign.)

The Garden school want to build a system to calculate students' grade and check they can apply for a scholarship. The system can let the administrator can log in this system (no database required) to work with different students' marks. You need to use the weight of each unit to calculate the final grade. The administrator should enter their account and password at first. They can start work when the account and password are correct. The administrator needs to typing students ID, and according to your prompts to type the following units' marks. The system must according to those marks to provide the final grade of the students. According to the description, the system should analysis each unit's marks to provide suitable prompts to let the administrator know that the student meets requirements. According to those results, the administrator can inform those students. Unit Name Description Weight Math Students can attend maths contest when they get 90 marks 30% Biology Students can apply the unit Ecology when they get 75 20% IT Students can get a Microsoft certificate when they get 85 in this unit 20% Painting Students' productions can be displayed on the school website when they can get 85 in this unit. 10% History 20% Final The student has the opportunity to apply for a scholarship when the final grade is HD. 100% Grade table Marks Grade Note >= 85 HD >=75 D >=65 C >=50 P <50 F Students need to enrol this unit next semester. Units' marks are 0 Not attend Students need to explain their absence and enrol this unit next semester. In the system, staff can type student’s id to find the students mark details, and staff can get a .txt file of the student's mark details. In the system, the student can use an account and password to login the system to check their marks and enrol their units. Students can type in the unit code to enrol their unit. One student can enrol no more than 4 unit at a semester. If a student enrols the unit first time, the fee of the unit will be plan A. If the student is the second time to enrol this unit (due to failed last semester), the fee of the unit would be plan B. For example, a student got F in math last semester; the student needs to enrol the unit this semester, but the fee is 1200 instead of 1000. The following are the units that students can enrol Unit Code Unit Name Fee (plan A) $AUD Fee (plan B) $AUD 4483 Math 1000 1200 4485 Biology 1580 1780 4486 Information technology 1580 1780 4487 Painting 1580 1780 4488 History 1000 1200 4489 Ecology 1000 1200 8873 Accounting 1000 1200 8872 Chief 1580 1780 8871 Spanish 1200 1200 Student can get a .txt file when they finish their enroll. There is a student record which is already saved in your program, the student can login the system to check his unit marks and final grade. The student will get Plan B fee when he enrols failed units. You need to display the fee of each unit, and the total fee of all unit. Staff also can get the student information when type in the student ID: Name: Tom ID: u123 Password: u123 Math: 48 Biology: 52 IT: 53 Painting: 45 History: 38 Final grade: F The student needs to enrol math, painting, history next semester.

Part 2: More Review of Confidence Intervals

The following questions might be more challenging, but we want you to wrestle through them and ask for clarification along the way. Talking through these problems with a neighbor can help, and we hope that, ultimately, working through these problems will strengthen your understanding of the big ideas behind confidence intervals.

1. A 95% confidence interval is constructed in order to estimate the average number of minutes college students spend on Facebook per day. The interval ends up being from 30.1 minutes to 47.1 minutes. Based on this interval, we know the sample mean must be __________________ and the margin of error must be _____________ . (Note that your answers should be in the form of numbers, and it might help to review the general format of the confidence interval presented earlier in this lab activity).

2. A 95% confidence interval for the proportion of college students who have texted during a class was 0.75 to 0.95. Which of the following is the 90% confidence interval from the same sample?

1. 0.05 to 0.25
2. 0.731 to 0.969
3. 0.766 to 0.934
4. 0.777 to 0.9

3. A 90% confidence interval is constructed in order to estimate the average number of hours college students spend studying per week. The resulting interval has a margin of error of 3 hours. Which of the following could be the margin of error for a 95% confidence interval based on the same sample of data?

A. 2 hours

B. 3 hours

C. 4 hours

D. 8 hours

E. This cannot be answered without knowing the sample size.

4. Which of the following statements about confidence intervals is not correct?  

1. A confidence interval is an interval of values computed from sample data that is likely to include the population parameter.
2. The general format of a confidence interval is “sample statistic ± margin of error.”
3. Doubling the population size will result in a more narrow confidence interval.
4. If you construct a confidence interval for a population mean, the size of the sample mean has no effect on the size of the margin of error.

5. Suppose that a survey is planned to estimate the proportion of the population of OSU students who are left-handed. The sample data will be used to form a confidence interval. Which one of the following combinations of sample size and confidence level will give the widest confidence interval?

1. n = 400, confidence level = 90%
2. n = 400, confidence level = 95%
3. n = 1000, confidence level = 90%
4. n = 1000, confidence level = 95%

6. A 95% confidence interval is calculated for the percentage of OSU students who believe the parking options offered at OSU are satisfactory. The resulting confidence interval is 59.5% to 64.4%. Based on this information, which of the following is not true?

1. The confidence interval was produced by a process that will capture the true population percentage 95% of the time.
2. We are 95% confident that the interval 59.5% to 64.4% contains the true population percentage of OSU students who believe the parking options offered at OSU are satisfactory.
3. We are 95% confident that the interval 59.5% to 64.4% contains the sample percentage of OSU students who believe the parking options offered at OSU are satisfactory.
4. The sample percentage was about 62%.

7. Based on a random sample of data, an administrator at Sweet Valley High School estimates, at a 99% confidence level, that 22% ± 8% of Sweet Valley High School students plan to take summer classes. If the school has 1420 students, this means the possible number of students who plan to take summer classes is from

1. 199 to 426 students.
2. 195 to 430 students.
3. 114 to 312 students.
4. 47 to 178 students.

Problem Description Students in Computer Information Systems (CIS) department at a local university are required to do some group-projects in their classes because their instructors believe the skills and competence to work as an effective team are important to assure a successful IT project. Group project helps IT students apply system design knowledge, solve real world business problems, enhance learning effective team skills, improve students’ business communication skills, and serve back to the community. In order to ensure an effective and functional group, each group has 3-4 members and a team leader is elected. The team makes a project plan based on the project activities. The team communication format is also decided. During the semester, students are asked to do multiple self- and peer- assessment based on the provided rubrics. The rubrics for the self- and peer assessment were developed based on previous studies and department faculty brain-storming. The primary focus of self- and peer- assessment is on the learning process of team skills. It should be used to enhancing team skill development. It can also be used as a reference or supplementary documents when faculty evaluates the final project. Nevertheless, due to the current paper-based instrument and manual process of administering the assessment, collecting the forms, data re-entry, calculation, and analysis, it is tedious and time-consuming for faculty members to implement the assessment, and it is difficulty for students to get an instant feedback from previous stage to improve their group performance. To address this issue, Dr. Larry Henson, a software engineering professor, decides to ask his students to design an online tool that can collect group peer evaluation data, do analysis, and generate reports. To have a better understanding of the functions and requirements of the peer-evaluation system, the faculty in the department had a meeting. Following is a summary of the meeting minutes. FacA: The system should allow Faculty assign students to different project teams. The same student in different class may participate in different project teams. FacB: The system should allow users to login with different roles such as faculty, students, and administrator. FacC: The system should allow a Faculty manages project teams for each class the faculty is teaching. FacD: The system may also be adopted by faculty in other departments as well as CIS faculty because some program core courses are offered by other departments. It is good to specify a system administrator. The administrator can manage faculty, classes, students, and rubric information. FacE: Students can do both self- and team-based peer assessments based on the specified rubrics. FacF: Students are allowed to view the assessment done by the team members so that they get instant feedback to improve their performance. FacG: The assessment should include both close-ended and open-ended questions. For instance, students are allowed to make comments upon assessing other team members FacH: The system should automatically generate different reports such as the average at the level of individual, team, and class. FacI: Students are also allowed to make comments upon assessments were done by other members. FacJ: All students comments should be reviewed and approved before exposed to other members. Understand the problem and define the scope of the project by 1) Identify functional requirements; 2) Identify domain classes and do domain model; 3) create a glossary or dictionary of the domain objects and give definition for each of them.

1–4 PART A - PLAN

The situation is as follows: With the cost of attendance rising, BYU administrators are worried that BYU students are graduating with more and more debt. In a random sample of 312 BYU undergraduate students who graduated in April 2019, 145 of them reported having student debt. Is there sufficient evidence to conclude that less than half of BYU undergraduate students who graduated in April 2019 have student debt? Use a 5% significance level. SHOW YOUR WORK IN ALL THE STEPS. ANSWERS WITHOUT SOLUTIONS WILL ONLY GET PARTIAL CREDIT.

As an example, if you were to take the square root of (2+2) / 3, please write it as sqrt((2+2)/3) when showing work.

1. State the name of the appropriate test procedure you will use (e.g., one-sample t test for means). (1pt)

2. Describe the parameter of interest in the context of the problem. (1 pt)

3. State the null and alternative hypotheses. (2 pts)

4. Write down the significance level. (1 pt.)

5. List and check the conditions for the test procedure you named above. (4 pts)

6. Obtain the value of the sample proportion (Round your answer to FOUR decimal places). Show your work. (1 pt)

7. Write the calculated test statistic (including your calculations) and its associated p-value using the appropriate table, not from statistical software. Round your final answer for the test statistic to two decimal places. Show formula and calculations. (2 pts)

8. Answer the question posed in the STATE step in context. Do this by including these three parts in your conclusion (3 pts): Compare p-value with α Decide whether to reject or fail to reject the null hypothesis State your conclusion in context.

Part B

The situation is as follows: With the cost of attendance rising, BYU administrators are worried that BYU students are graduating with more and more debt. In a random sample of 312 BYU undergraduate students who graduated in April 2019, 145 of them reported having student debt. Calculate a 98% confidence interval estimate for the proportion of BYU undergraduate students who graduated in April 2019 who have student debt. SHOW YOUR WORK IN ALL THE STEPS. ANSWERS WITHOUT SOLUTIONS WILL ONLY GET PARTIAL CREDIT.

As an example, if you were to take the square root of (2+2) / 3, please write it as sqrt((2+2)/3) when showing work.

9. State the name of the appropriate estimation procedure (e.g. one-sample t confidence interval for estimating the mean difference). (1 pt) (Note) You have already described the parameter being estimated in part A, so you don't have to repeat it here.

10. You have already listed the conditions, now check the condition for the normality of the sampling distribution of p-hat for confidence interval estimation. (1 pt.)

11. Write down the confidence level and the z* critical value. (2 pts.)

12. Calculate the confidence interval in interval form. Be sure to show your work. Round your final answer for the lower and upper limits to three decimal places. (2 pts)

13. Interpret your confidence interval in context. Do this by including these three parts in your conclusion (3 pts): Level of confidence Parameter of interest in context The interval estimate

1. Let A be the set whose elements are the months of the year that begin with the letter J. A = { }

2. Define a set that is empty. Let B be the set: _________________________________________________________________________ _________________________________________________________________________

3. The following data was collected from a survey of 350 San Antonio residents Are you a Spurs fan? YES NO Male 204 19 Female 113 14

a. How many males were surveyed?

b. How many spurs fans were surveyed?

c. How many San Antonians surveyed are not fans and male? d. How many San Antonians surveyed are fans or female?

e. How many San Antonians surveyed are fans or male? f. How many San Antonians surveyed are not fans or female?

4. Let

X = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}

A = {1, 2, 5, 7, 8, 10, 14, 15} and B = {2, 3, 5, 9, 10, 13} and C = {2, 7, 10, 12, 14, 15}

a. A ∩ C = b. A ∪ B =

c. B ∩ C = d. A ∩ B ∩ C =

5. Gilbert asked his group of 10 friends from middle school the following questions:

Do you ride the bus? Do you get picked up?

Their responses are shown in the Venn diagram below:

Bus Pickup

Jenna Ron Leslie

Rick Vic Debbie

Johnny Pablo

Use the Venn diagram to list the elements of each set.

a. The set of students who ride the bus

b. The set of students who get picked-up

c. The set of students who ride the bus or get picked up

d. The set of students who ride the bus and get picked up

e. The set of students who don’t ride the bus nor get picked up

f. The set of students who ride the bus but do not get picked up Jenna Rick Johnny Leslie Debbie Pablo

6. A group of 100 people touring Europe includes 51 people who speak French 57 who speak Polish, and 16 who speak neither language.

a. Construct a Venn diagram describing this situation.

b. How many people in the group speak both French and Polish?

7. A small combination lock on a suitcase has 4 wheels, each labeled with the 10 digits 0 to 9.

a. How many 4 digit combinations are possible if no digit is repeated?

b. If digits can be repeated?

c. If successive digits must be different?

8. A card is drawn from a standard 52-card deck. If the card is an ace, you win $12; otherwise, you lose $2. What is the expected value of the game?

9. Ten thousand raffle tickets are sold at $2 each for a local benefit. Tickets will be drawn at random and monetary prizes awarded as follows: 2 prizes of $1,000, 4 prizes of $500, and 10 prizes of $100. What is the expected value if you buy 1 raffle ticket?

10. An insurance company charges an annual premium of $75 for a $200,000 insurance policy against a house burning down. If the empirical probability that a house burns down in a given year is 0.0003, what is the expected value of the policy to the insurance company?

Over the last several years, the average exam grade in social psychology was 86, with a standard deviation of 7. This year, 25 social psychology students have a mean of 82. Are these students different from average social psychology students?

One-tailed or two-tailed?                                            Critical value (with  = .05):

Null Hypothesis (H₀): This sample________________________________________________________

___________________________________________________________________________________

Alternative Hypothesis (H_a): This sample ___________________________________________________

___________________________________________________________________________________

Compute z:

z =                               Reject or fail to reject the null hypothesis?

Interpret result

The Student Recreation Center wanted to determine what sort of physical activity was preferred by students. In a survey of 89 random students, 68 indicated that they preferred outdoor exercise over exercising in a gym. The 95% confidence interval estimating the proportion of all students at the university who prefer outdoor exercise is given by which of the following?

Question 9 options:

Suppose a professor splits their class into two groups: students whose last names begin with A-K and students whose last names begin with L-Z. If p1 and p2 represent the proportion of students who have an iPhone by last name, would you be surprised if p1 did not exactly equal p2? If we conclude that the first initial of a student's last name is NOT related to whether the person owns an iPhone, what assumption are we making about the relationship between these two variables?