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

Expected value for each project, Your company has asked you to analyze two ...

Your company has asked you to analyze two mutually exclusive projects for the coming year. Project A will have an initial outlay of $7,200. Project B will cost $6,800. Both project

Find out the opportunity cost of corn, Outline briefly a.      How peopl...

Outline briefly a.      How people make decisions? b.      How they interact? c.       How economy as a whole works? 1.  Give three examples of important trade offs, th

Flossy''s budget constraint, Flossy has a quasi-linear utility function, 16...

Flossy has a quasi-linear utility function, 16q1^0.5 + q2. The price of good 1 is fixed at one. Thus, Flossy's budget constraint is q1 + p2q2 =Y, where Y denotes income. 6.1 Compu

European commission bail, Will the Euro survives? 1. Why are Greece, Ire...

Will the Euro survives? 1. Why are Greece, Ireland, Italy, Portugal, and Spain sometimes referred to as the euros zones "peripheral countries"? 2. Why did the European commis

AD-AS, THE AD CURVE SHIFT TO THE LEFT WHEN

THE AD CURVE SHIFT TO THE LEFT WHEN

Describe a hypothetical ideal, Design a hypothetical ideal randomized contr...

Design a hypothetical ideal randomized controlled experiment to study the effects on highway traffic deaths of wearing seat belts. Suggest some impediments to implementing this exp

Impact will high and variable rates of inflation, What impact will high and...

What impact will high and variable rates of inflation have on the economy? How will they influence the risk accompanying long-term contracts and related business decisions?

Kinked demand curve, disuss with an aid of a diagram the kinked demand cur...

disuss with an aid of a diagram the kinked demand curve

Concept of amximization and assumptions associated the econo, PREPARE AN ES...

PREPARE AN ESSAY ON THE CONCEPT OF MAXIMIZATION AND THE ASSUMPTIONS ASSOCIATED WITH THE BEHAVIOR OF THE ECONOMIC MAN

What is the monopole and dipole moment, Charge is distributed with constan...

Charge is distributed with constant volume density D throughout the rectangular box with length a, width b and height c.  a) what is the monopole moment of this system. b) What i

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