Will improving customer service result in higher stock prices for the companies providing the better service? "When a co

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Will improving customer service result in higher stock pricesfor the companies providing the better service? "When a company'ssatisfaction score has improved over the prior year's results andis above the national average (currently ), studies show itsshares have a good chance of outperforming the broad stock marketin the long run." The following satisfaction scores of threecompanies for the 4th quarters of two previous years were obtainedfrom the American Customer Satisfaction Index. Assume that thescores are based on a poll of customers from eachcompany. Because the polling has been done for several years, thestandard deviation can be assumed to equal points ineach case.
a. For Rite Aid, is the increase in thesatisfaction score from year 1 to year 2 statistically significant?Use and null hypothesis is . What can youconclude?
The difference - Select your answer -isis notItem3 statistically significant.
b. Can you conclude that the year 2 scorefor Rite Aid is above the national average of ?Use and null hypothesis is . Enter negative valueas negative number.
We - Select your answer -can concludecannot concludeItem6 that customer service has improved for Rite Aid.
c. For Expedia, is the increase from year1 to year 2 statistically significant? Use and nullhypothesis is .
The difference - Select your answer -isis notItem9 statistically significant.
d. When conducting a hypothesis test withthe values given for the standard deviation, sample size,and , how large must the increase from Year 1 to Year 2 be forit to be statistically significant?
(to 2 decimals)
e. Use the result of part (d) to statewhether the increase for J.C. Penney from year 1 to year 2 isstatistically significant.
The increase - Select your answer -isis notItem11 statistically significant.