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fou want to buy a washing machine, and a salesperson tells you that the mean repair costs for Model A and Model B are equal. You research the repair costs. The mean repair cost of 20 Model A washing machines is $211. Assume the population standard deviation is $20. The mean repair cost of 21 Model B washing machines is $222. Assume the population standard deviation is $25. At a = 0.01, can you reject the salesperson's claim? Assume the samples are random and ndependent, and the populations are normally distributed. Complete parts (a) through (e). Let u, be the mean repair cost for Model A and let u, be the mean repair cost for Model B. What are Ho and H,? OA. Ho: H1 2 b) Find the critical value(s) and identify the rejection region(s). The critical value(s) is/are -2.58, 2.58 . Round to two decimal places as needed. Use a comma separate answers as needed.) What is/are the rejection region(s)? Select the correct choice below and fill in the answer box(es) within your choice. Round to two decimal places as needed.) VA. z< -2.58 , z> 2.58 O B. OC. z> c) Find the standardized test statistic z for u, "42- = (Round to two decimal places as needed.)

fou want to buy a washing machine, and a salesperson tells you that the mean repair costs for Model A and Model B are equal. You research the repair costs. The mean repair cost of 20 Model A washing machines is $211. Assume the population standard deviation is $20. The mean repair cost of 21 Model B washing machines is $222. Assume the population standard deviation is $25. At a = 0.01, can you reject the salesperson's claim? Assume the samples are random and ndependent, and the populations are normally distributed. Complete parts (a) through (e). Let u, be the mean repair cost for Model A and let u, be the mean repair cost for Model B. What are Ho and H,? OA. Ho: H1 2 b) Find the critical value(s) and identify the rejection region(s). The critical value(s) is/are -2.58, 2.58 . Round to two decimal places as needed. Use a comma separate answers as needed.) What is/are the rejection region(s)? Select the correct choice below and fill in the answer box(es) within your choice. Round to two decimal places as needed.) VA. z< -2.58 , z> 2.58 O B. OC. z> c) Find the standardized test statistic z for u, "42- = (Round to two decimal places as needed.)

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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You want to buy a washing machine, and a salesperson tells you that the mean repair costs for Model A and Model B are equal. You research the repair costs. The mean repair cost of 20 Model A washing machines is $211. Assume the population standard deviation is $20. The mean repair cost of 21 Model B washing machines is $222. Assume the population standard deviation is $25. At a = 0.01, can you reject the salesperson's claim? Assume the samples are random and independent, and the populations are normally distributed. Complete parts (a) through (e). Let u, be the mean repair cost for Model A and let µ, be the mean repair cost for Model B. What are Ho and H,? A. Ho: H1 <H2 Ha: H12 H2 B. Ho: H1 SH2 Hai H1 > H2 C. Ho: H12 H2 Hai H1 <H2 E. Ho: H1 = H2 Ha: H1 # H2 O F. Ho: 41> H2 O D. Ho: H1 + H2 Hai H1 =H2 Ha: H1 SH2 (b) Find the critical value(s) and identify the rejection region(s). The critical value(s) is/are – 2.58, 2.58. (Round to two decimal places as needed. Use a comma to separate answers as needed.) What is/are the rejection region(s)? Select the correct choice below and fill in the answer box(es) within your choice. (Round to two decimal places as needed.) A. z< - 2.58 , z> 2.58 В. (c) Find the standardized test statistic z for u, - H2. |(Round to two decimal places as needed.)
Transcribed Image Text:You want to buy a washing machine, and a salesperson tells you that the mean repair costs for Model A and Model B are equal. You research the repair costs. The mean repair cost of 20 Model A washing machines is $211. Assume the population standard deviation is $20. The mean repair cost of 21 Model B washing machines is $222. Assume the population standard deviation is $25. At a = 0.01, can you reject the salesperson's claim? Assume the samples are random and independent, and the populations are normally distributed. Complete parts (a) through (e). Let u, be the mean repair cost for Model A and let µ, be the mean repair cost for Model B. What are Ho and H,? A. Ho: H1 <H2 Ha: H12 H2 B. Ho: H1 SH2 Hai H1 > H2 C. Ho: H12 H2 Hai H1 <H2 E. Ho: H1 = H2 Ha: H1 # H2 O F. Ho: 41> H2 O D. Ho: H1 + H2 Hai H1 =H2 Ha: H1 SH2 (b) Find the critical value(s) and identify the rejection region(s). The critical value(s) is/are – 2.58, 2.58. (Round to two decimal places as needed. Use a comma to separate answers as needed.) What is/are the rejection region(s)? Select the correct choice below and fill in the answer box(es) within your choice. (Round to two decimal places as needed.) A. z< - 2.58 , z> 2.58 В. (c) Find the standardized test statistic z for u, - H2. |(Round to two decimal places as needed.)
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