Conclude a hypothesis test, Macroeconomics

Assignment Help:

Will improving customer service result in higher stock prices for the companies providing the better service? When a companys satisfaction score has improved over the prior years results and is above the national average (currently 75.7), studies show its shares have a good chance of outperforming the broad stock market in the long run (Business- Week, March 2, 2009). The following satisfaction scores of three companies for the 4th quarters of 2007 and 2008 were obtained from the American Customer Satisfaction Index. Assume that the scores are based on a poll of 60 customers from each company. Because the polling has been done for several years, the standard deviation can be assumed to equal 6 points in each case.

Company 2007 Score 2008 Score
Rite Aid 73 76
Expedia 75 77
J.C. Penney 77 78

a. For Rite Aid, is the increase in the satisfaction score from 2007 to 2008 statistically significant?
Use ? ? = :05. What can you conclude?

b. Can you conclude that the 2008 score for Rite Aid is above the national average of 75.7? Use ? ? = :05.

c. For Expedia, is the increase from 2007 to 2008 statistically significant? Use ? = :05.

d. When conducting a hypothesis test with the values given for the standard deviation, sample size, and ?, how large must the increase from 2007 to 2008 be for it to be statistically significant?

e. Use the result of part (d) to state whether the increase for J.C. Penney from 2007 to 2008 is statistically significant.


Related Discussions:- Conclude a hypothesis test

Determine the net terminal year cash flow, A company is assessing a propose...

A company is assessing a proposed 4-year project.  The depreciable cost will involve the following: $300,000 for the equipment, $20,000 for shipping, and $30,000 for installation.

Equilibrium in the money market, Equilibrium in the money market  ...

Equilibrium in the money market  In the IS-LM-model, we have equilibrium in the money market when MD(Y, R) = MS   This is the equation

Economic concepts models- demand/supply concepts, Questions: ...

Questions: Search through newspapers for ONE article that is relevant to the economics concepts. You are also required to attach the article to your final report

Trade cycle, discus the various measures that may be taken by a firm to cou...

discus the various measures that may be taken by a firm to counteract the evil effect of a trade cycle

Aggregate demand with inflation, Aggregate demand with inflation In pre...

Aggregate demand with inflation In previous versions of Keynesian model, Components of aggregate demand did not depend on P. In IS-LM and in AS-AD models, investments depended

Market structure, Ask question #Minimum 100 words accepWith aid of evidence...

Ask question #Minimum 100 words accepWith aid of evidence in the given article, comprehensively discuss the market structure in the South African mobile telecommunications industry

Mec, Lucas’ point of view, what are the limitations of the Keynesian model?...

Lucas’ point of view, what are the limitations of the Keynesian model? What improvements does he suggest?

Uncontrollable environmental variables, Consider an international firm you ...

Consider an international firm you are familiar with and what the firm needs to be concerned with when entering a foreign market. Specifically, in terms of the chapters you covered

Currency, Assume that Jimmy Cash has $2100 in his checking account and uses...

Assume that Jimmy Cash has $2100 in his checking account and uses his checking card to withdraw $210 from his ATM machine. By what amount did M1 change from this individual transac

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd