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). . Ine mean repair coSI Ior Mouer A IS Iess unan MOuer D. D. The mean repair costs for Model A and Model B are equal. 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? O A. Ho: H1 H2 (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 O B. z< O C. z> (c) Find the standardized test statistic z for u, -H2- (Round to two decimal places as needed.)
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). . Ine mean repair coSI Ior Mouer A IS Iess unan MOuer D. D. The mean repair costs for Model A and Model B are equal. 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? O A. Ho: H1 H2 (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 O B. z< O C. z> (c) Find the standardized test statistic z for u, -H2- (Round to two decimal places as needed.)
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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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).
The mean repair cos Tor iModel A IS less tnan Model B.
D. The mean repair costs for Model A and Model B are equal.
Let
be the mean repair cost for Model A and let u, be the mean repair cost for Model B. What are Ho and H,?
O A. Ho: H1 <H2
Hai H1Z H2
B. Ho: H1 SH2
Ha: H1 > H2
C. Ho: H12 H2
Ha: H1 < H2
O F. Ho: H1 > H2
O D. Ho: H1 # H2
Hại H1 = H2
E. Ho: H1= H2
Hai H1 # H2
(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. Z<
O C. z>
(c) Find the standardized test statistic z for u, - p2.
(Round to two decimal places as needed.)
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