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

Calculate competitive equilibrium quantity, Assume a competitive industry w...

Assume a competitive industry with two hospitals. The hospitals compete in price (such that P = MC ), face the inverse demand curve =10 - Q , and have a constant marginal cost of

Define the points of individual choices makes and interact, Define the poin...

Define the points of individual choices makes and interact. A. How individuals make choices: • Scarcity • Opportunity cost • Trade-offs • Marginal analysis B. Ho

Survivor Island, the central economic problem facing the group of survivors...

the central economic problem facing the group of survivors

Define the multiplier and rate of inflation, 1 (a) List two concerns with i...

1 (a) List two concerns with inflation. (b) Suppose that we are in a condition of fully flexible prices, but production of nails will not go above 200 chairs/month. What price w

World in the cross model, The rest of the world in the cross model ...

The rest of the world in the cross model Imports Im(Y) depends positively on Y in the cross model In the classical model, imports doesn't depen

Mundel fleming model., The mundelfleming model takes the world interst rate...

The mundelfleming model takes the world interst rate r* as anexogenous variable.Let,consider what happen when this variable changes.a,what maight cause the world interest rate tori

Interest rate determination, Interest rate determination  ...

Interest rate determination  The real interest rate r will be equal to the equilibrium real interest rate In the classical model we define equil

Is consumption depend on GDP in the cross model, Q. Is Consumption depend o...

Q. Is Consumption depend on GDP in the cross model? Aggregate demand The consumption function Consumption C(Y) depends positively on GDP in the cross

Revenue theory, calculate, a.the total revenue b.the average revenue c.the ...

calculate, a.the total revenue b.the average revenue c.the marginal revenue price 5 4 3 2 1 0 quantity 0 1 2 3 4 5.

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