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

Factors affecting the price elasticity of demand, Q. Discuss about the fact...

Q. Discuss about the factors affecting the Price Elasticity of Demand. a. Availability of Substitute- Availability of close substitute is important determinants of elasticity of

Production function stuff, 1. Given the following production function: ...

1. Given the following production function: Y = K1/4 L3/4 Find the following: a. Per worker production function. b. Steady-state capital-labor ratio as a function of d and

Shortage, Shortage, Surplus and Price Mechanism: A shortage is the situ...

Shortage, Surplus and Price Mechanism: A shortage is the situation in which the demand exceeds supply, which means producers are unable to meet the market demand for the produc

Project of introducing a new product in africa, How to prepare a a project...

How to prepare a a project on a new product in africa.

TAXATION, What is Inherent Limitation?

What is Inherent Limitation?

Aplia Assignment, Need answers for problems after chapters 10, 11 & 12 for ...

Need answers for problems after chapters 10, 11 & 12 for Macroeconomics in Aplia.com. Need today or tomorrow. Can you help?

Uniform series of payments, Your project has an estimated cost for land rec...

Your project has an estimated cost for land reclamation to be realized at the end of 20 years from today for $70,000,000. If current bond long-term interest rates are 7% compounded

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