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

Pr0ject 2, how long will be the solution

how long will be the solution

Effects in addition to the direct effect on dairy prices, Subsidy programs ...

Subsidy programs are likely to have a number of secondary effects in addition to the direct effect on dairy prices. What impact do you suppose farm subsidies are likely to have on

Effect of real wage in classical labour market, illustrate the effects of a...

illustrate the effects of a reeal wage existing in the labour market if it is perfectly competitive

Who was the labour chancellor gordon brown, Who was the Labour Chancellor G...

Who was the Labour Chancellor Gordon Brown In the period between 1997 and 2006 the Labour Chancellor Gordon Brown was committed to self-imposed Sustainable Investment Rule that

Telemarketer makes six phone calls, A telemarketer makes six phone calls pe...

A telemarketer makes six phone calls per hour and is able to make a sale on 30 percent of these contacts. During the next two hours, find: A) The probability of making exactly four

Determine the exchange rate, Determine the exchange rate When a currenc...

Determine the exchange rate When a currency is freely floating, the central bank doesn't have to set monetary policy to alter the external value of the currency unless instruct

Chained dollar method and real gdp, how do I calculate the chained dollar m...

how do I calculate the chained dollar method for real gdp

Budget, what are the function of budget

what are the function of budget

BUS668, Prepare calculations and a one to two page analysis, following the ...

Prepare calculations and a one to two page analysis, following the APA guidelines, that addresses the following: Assuming that the expectations theory is the correct theory of the

Macro, Difference between mec and mei.

Difference between mec and mei.

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