Questions 1 to 20 Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer. 1. A random sample of 100 observations from a population with standard deviation 60 yields a sample mean of 110. Test the null hypothesis that H μ = 100 versus Hα μ > 100 using α = .05

When you have completed your exam and reviewed your answers, click Submit Exam. Answers will not be recorded until you hit Submit Exam. If you need to exit before completing the exam, click Cancel Exam.

Questions 1 to 20: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.

1. A random sample of 100 observations from a population with standard deviation 60 yields a sample mean of 110. Test the null hypothesis that H : μ = 100 versus Hα : μ > 100 using α = .05

A. z = 1.96

B. z = 1.67

C. z = 1.69

D. z = 2.09

2. A company that develops artificial intelligence designed to detect false statements has developed a program that police officers can use to determine whether a criminal suspect is lying or not. According to the company, the AI can detect false statements correctly 75% of the time. What are the null and alternative hypothesis for testing the claim that the AI detects false statements as claimed by the company? A. H0 : p = .25, Hα : p ≠ .25

B. H0 : p = .75, Hα : p ≠ .75

C. H0 : p = .01, Hα : p ≠ .01

D. H0 : p = .99, Hα : p ≠ .99

3. Determine the power for the following test of hypothesis. H0 : μ = 950 vs. H1 : μ ≠ 950, given than μ = 1,000, α = 0.10, σ = 200, and n = 25.

A. 0.3465

B. 0.4938

C. 0.5062

D. 0.6535

4. To schedule appointments better, the office manager for an ophthalmologist wants to estimate the average time that the doctor spends with each patient. A random sample of 49 is taken, and the sample mean is 20.3 minutes. Assume that the office manager knows from past experience that the standard deviation is 14 minutes. She finds that a 95% confidence interval is between 18.3 and 22.3 minutes. What’s the point estimate of the population mean, and what’s the confidence coefficient? A. 20.3, 0.95

B. 18.3, 0.95

C. 18.3, 0.05

D. 20.3, 0.05

5. A random sample of 70 observations from a normally distributed population produced a mean of x = 26.2 and a standard deviation of s = 4.1. Find an approximate 99% confidence interval for the population mean, μ. A. 25.1 ± .169

B. 26.2 ± .1.26

C. 26.4 ± .156

D. 28.3 ± .155

6. Consider a null hypothesis stating that the population mean is equal to 52, with the research hypothesis that the population mean isn’t equal to 52. Assume you’ve collected 38 sample data from which we computed a sample mean of 53.67 and a sample standard deviation of 3.84. Further assume the sample data appear approximately normal. What’s the p-value you would report for this test? A. 0.0025

B. 0.0074

C. 0.0084

D. 0.0041

7. A human resources manager wants to determine a confidence interval estimate for the mean test score for the next office-skills test to be given to a group of job applicants. In the past, the test scores have been normally distributed with a mean of 74.2 and a standard deviation of 30.9. Determine a 95% confidence interval estimate if there are 30 applicants in the group. A. 68.72 to 79.68

B. 64.92 to 83.48

C. 13.64 to 134.76

D. 63.14 to 85.26

8. A random sample of 10 employees is selected from a large firm. For the 10 employees, the number of days each was absent during the past month was found to be 0, 2, 4, 2, 5, 1, 7, 3, 2, and 4. Of the following values, which would you use as the point estimate for the average number of days absent for all the firm’s employees? A. 3

B. 30

C. 4

D. 2.5

9. Assuming N = 10,000, n = 4,000, and s = 50, compute the standard error of x using the finite population correction factor. A. .6024

B. .6124

C. .5931

D. .6358

10. Using a sample size of n = 400. If σ = 20 and x = 72.5, find the value of the test statistic. Consider the test H0 : μ = 70 versus Hα : μ > 70

A. 2.5

B. 2.3

C. 1.8

D. 2.25

11. What’s the rejection region for a two-tailed test when α = 0.05? A. | z | > 1.645

B. | z | > 1.96

C. | z | > 2.575

D. z > 2.575

12. Construct a 90% confidence interval for p for a random sample of size n = 121 yielded A. 8.8 ± .698

B. 9.2 ± .182

C. 8.9 ± .145

D. 8.8 ± .049

13. Assume a random sample of n = 5 measurements from a normal distribution. Compare the standard normal z-values with the corresponding t-values if you were forming a 99% confidence interval. A. 1.96; 2.776

B. 1.645; 2.132

C. 1.282; 1.533

D. 2.576; 4.604

14. Where is the rejection region if t > 1.440 and df = 6? A. α = .02 B. α = .10 C. α = .05 D. α = .01

15. In the statement of a null hypothesis, you would likely find which of the following terms? A. =

B. <

C. >

D. +

16. Nondirectional assertions lead only to _______-tail tests. A. right

End of exam

B. left

C. one

D. two

17. Your state decides to mandate a shortened 30-hour workweek for all companies with 20 or more employees. Economics researchers studying the impacts of a shortened work week on unemployment rates found several key variables, including whether employees held multiple jobs, hourly wages, and level of employment across the economy. Assuming that the year before the enactment of the 30-hour workweek law unemployment in your state was 12%. In a random sample of 500 employable residents of the state, 53 were unemployed. Conduct a test of hypothesis to determine if your state’s unemployment rate dropped after the shortened workweek law was passed. Test using α = 0.05 A. z = –.96

B. z = –.90

C. z = .96

D. z = –.88

18. What type of test will be performed? H is p = 0.45 and H1 is p ≠ 0.45

A. One-tail testing of a mean

B. One-tail testing of a proportion

C. Two-tail testing of a proportion

D. Two-tail testing of a mean

19. Which element of a test of a hypothesis is used to decide whether to reject the null hypothesis in favor of the alternative hypothesis? A. Rejection region

B. Test statistic

C. Level of significance

D. Conclusion

20. A mortgage broker is offering home mortgages at a rate of 9.5%, but the broker is fearful that this value is higher than many others are charging. A sample of 40 mortgages filed in the county courthouse shows an average of 9.25% with a standard deviation of 8.61%. Does this sample indicate a smaller average? Use α = 0.05 and assume a normally distributed population. A. Yes, because the sample mean of 9.25 is below 9.5.

B. No, because the test statistic falls in the acceptance region.

C. No, because the test statistic is –1.85 and falls in the rejection region.

D. Yes, because the test statistic is greater than –1.645.

Calculate your paper price
Pages (550 words)
Approximate price: -

Quality Research Papers

We always make sure that our academic writers follow all your instructions precisely. You can choose your academic level and we will assign a writer who has a respective degree.


Best Academic Writers

We have a team of professional writers with experience in academic and business writing. Many are native speakers and able to perform any task for which you need help.


Unlimited Revisions

If you think we missed something, send your order for a free revision. You have 10 days to submit the order for review after you have received the final document.


On time Delivery

All papers are always delivered on time. In case we need more time to master your paper, we may contact you regarding the deadline extension. Otherwise a 100% refund is guaranteed.


Original & Confidential

We use several writing tools checks to ensure that all documents you receive are free from plagiarism. We also promise maximum confidentiality in all of our services.


24/7 Customer Support

Our support agents are available 24 hours a day 7 days a week and committed to providing you with the best customer experience. Get in touch whenever you need any assistance.

Try it now!

Calculate the price of your order

Total price:

How it works?

Follow these simple steps to get your paper done

Homework Market

Place your order

Fill in the order form and provide all details of your assignment.

Homework Market

Proceed with the payment

Choose the payment system that suits you most.

Homework Market

Receive the final file

Once your paper is ready, we will email it to you.

Academic Writing Services

Whether you have an urgent deadline or those that have time. You can take some time and relax after trusting us with your paper. We make sure that we conduct the academic writing services diligently.

Acemyhomework Acemyhomework


Essay Writing Service

Among the wide variety of academic work, essay writing is one of the simplest a student can ever come across. Usually, it is a task which students encounter and learn how to write whilst in high school. However, the case is quite different when it comes to university and college.

Acemyhomework Acemyhomework

Term Papers

Term Paper Writing

Are you looking for an online writing firm that can offer you reliable custom term paper writing help? Is your wish and desire to get someone who can guide you throughout the process of writing term papers? If yes, then you have come to the right place.

Acemyhomework Acemyhomework


Coursework Writing Help

Coursework is essential for every student in order to graduate from college. However, most of it is deadline-centric, and that becomes a challenge to most learners. With the amount of work, learners are receiving every day, finding time to work on every task is not easy.

Acemyhomework Acemyhomework


Online Homework Help

Online homework help services are an answer to every challenge that students go through. Despite the difference in the needs and levels of learning, all students can benefit from these services. Acemyhomework is one of the best online homework help service companies you can find on the internet.