a. For Rite Aid, is the increase in the satisfaction score from Year 1 to Year 2 statistically significant? Use a = 0.05 and null hypothesis is Ho : µ1 – µ2 < 0. Find the test statistic and p-value. Use Table 1 of Appendix B. z value (to 2 decimals) p-value (to 4 decimals) What can you conclude? The difference - Select your answer - statistically significant. b. Can you conclude that the Year 2 score for Rite Aid is above the national average of 75.7? Use a = 0.05 and test the null hypothesis Ho : µ < 75.7. Find the test statistic and p-value. Use Table 1 of Appendix B. z value (to 2 decimals) p-value (to 4 decimals) What can you conclude? We - Select your answer - v that customer service has improved for Rite Aid. c. For Expedia, is the increase from Year 1 to Year 2 statistically significant? Use a = 0.05 and test the null hypothesis Ho : µ1 - 12 <0. Find the test statistic and p-value. Use Table 1 of Appendix B. z value (to 2 decimals) p-value (to 4 decimals) What can you conclude? The difference - Select your answer - v statistically significant. d. When conducting a hypothesis test with the values given for the standard deviation, sample size, and a, how large must the increase from Year 1 to Year 2 be for it to be statistically significant? (to 2 decimals) e. Use the result of part (d) to state whether the increase for J.C. Penney from year 1 to year 2 is statistically significant. The increase - Select your answer v statistically significant.
a. For Rite Aid, is the increase in the satisfaction score from Year 1 to Year 2 statistically significant? Use a = 0.05 and null hypothesis is Ho : µ1 – µ2 < 0. Find the test statistic and p-value. Use Table 1 of Appendix B. z value (to 2 decimals) p-value (to 4 decimals) What can you conclude? The difference - Select your answer - statistically significant. b. Can you conclude that the Year 2 score for Rite Aid is above the national average of 75.7? Use a = 0.05 and test the null hypothesis Ho : µ < 75.7. Find the test statistic and p-value. Use Table 1 of Appendix B. z value (to 2 decimals) p-value (to 4 decimals) What can you conclude? We - Select your answer - v that customer service has improved for Rite Aid. c. For Expedia, is the increase from Year 1 to Year 2 statistically significant? Use a = 0.05 and test the null hypothesis Ho : µ1 - 12 <0. Find the test statistic and p-value. Use Table 1 of Appendix B. z value (to 2 decimals) p-value (to 4 decimals) What can you conclude? The difference - Select your answer - v statistically significant. d. When conducting a hypothesis test with the values given for the standard deviation, sample size, and a, how large must the increase from Year 1 to Year 2 be for it to be statistically significant? (to 2 decimals) e. Use the result of part (d) to state whether the increase for J.C. Penney from year 1 to year 2 is statistically significant. The increase - Select your answer v statistically significant.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
Transcribed Image Text:a. For Rite Aid, is the increase in the satisfaction score from Year 1 to Year 2 statistically significant? Use a =
0.05 and null hypothesis is Ho : µ1 – µ2 <0. Find the test statistic and p-value. Use
Table 1 of Appendix B.
z value
(to 2 decimals)
p-value
(to 4 decimals)
What can you conclude?
The difference
- Select your answer - v statistically significant.
b. Can you conclude that the Year 2 score for Rite Aid is above the national average of 75.7? Use a = 0.05 and test the null hypothesis Ho : µ 75.7. Find the test statistic and p-value. Use Table
1 of Appendix B.
z value
(to 2 decimals)
p-value
(to 4 decimals)
What can you conclude?
We
- Select your answer - v that customer service has improved for Rite Aid.
c. For Expedia, is the increase from Year 1 to Year 2 statistically significant? Use a = 0.05 and test the null hypothesis Ho : µ1 – µ2 < 0. Find the test statistic and p-value. Use Table 1 of
Appendix B.
z value
(to 2 decimals)
p-value
(to 4 decimals)
What can you conclude?
The difference
- Select your answer - v statistically significant.
d. When conducting a hypothesis test with the values given for the standard deviation, sample size, and a, how large must the increase from Year 1 to Year 2 be for it to be statistically significant?
(to 2 decimals)
e. Use the result of part (d) to state whether the increase for J.C. Penney from year 1 to year 2 is statistically significant.
The increase
Select your answer - v statistically significant.
Transcribed Image Text:Will improving customer service result in higher stock prices for the companies providing the better service? "When a company's satisfaction score has improved over the prior year's results and is
above the national average (75.7), studies show its shares have a good chance of outperforming the broad stock market in the long run." The following satisfaction scores of three companies for the
fourth quarters of two previous years were obtained from the American Customer Satisfaction Index. Assume that the scores are based on a poll of 67 customers from each company. Because the
polling has been done for several years, the standard deviation can be assumed to equal 8 points in each case.
ETT
Company
Year 1 Score
Year 2 Score
Rite Aid
72
74
Expedia
72
75
J.C. Penney
74
81
a. For Rite Aid, is the increase in the satisfaction score from Year 1 to Year 2 statistically significant? Use a = 0.05 and null hypothesis is Ho : µ1 – µ2 <0. Find the test statistic and p-value. Use
Table 1 of Appendix B.
z value
(to 2 decimals)
p-value
(to 4 decimals)
What can you conclude?
The difference
- Select your answer - v statistically significant.
b. Can you conclude that the Year 2 score for Rite Aid is above the national average of 75.7? Use a =
0.05 and test the null hypothesis Ho : µ < 75.7. Find the test statistic and p-value. Use Table
1 of Appendix B.
z value
(to 2 decimals)
p-value
(to 4 decimals)
What can you conclude?
We
- Select your answer - v that customer service has improved for Rite Aid.
c. For Expedia, is the increase from Year 1 to Year 2 statistically significant? Use a = 0.05 and test the null hypothesis Ho : µ1 – µ2 < 0. Find the test statistic and p-value. Use Table 1 of
Appendix B.
z value
(to 2 decimals)
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