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

Managers could address the challenge, Analyze the ways in which managers co...

Analyze the ways in which managers could use the Federal Register to determine the single most significant challenge associated with its use, and how managers could address that ch

Define mortgage, When did mortgage? Default and housing foreclosure rates b...

When did mortgage? Default and housing foreclosure rates begin to rise rapidly? When did the economy go into recession? Was there a causal relationship between the two? Discuss.

Peers for a country, What are the best criteria to select peers for a count...

What are the best criteria to select peers for a country ?

What is the value of the test statistic, For the United States, the mean mo...

For the United States, the mean monthly Internet bill is $32.79 per household (CNBC, January 18, 2006). A sample of 50 households in a southern state showed a sample mean of $30.63

Money and banking, Suppose the price level in year 2009 is 100 and $100 buy...

Suppose the price level in year 2009 is 100 and $100 buys 100 notebooks that year. If the price level rises to 125 in year 2010, what is the new value or purchasing power of the do

Introducing the foreign trade sector, Introducing the Foreign Trade Sector ...

Introducing the Foreign Trade Sector  Most economies in the real world are open economies. They engage in trade with other economies. Goods and services are exported and import

Choice amonga lottery, You have a choice between a lottery lump sum payout ...

You have a choice between a lottery lump sum payout of $10,000,000 today or a series of 25 annual annunity payments the first payment will be one year from today ad a discount rate

Internatinal trade, HOW CAN A COUNTRY MAINTAIN EQUILIBRIUM GDP IN AFOREIGN ...

HOW CAN A COUNTRY MAINTAIN EQUILIBRIUM GDP IN AFOREIGN TRADE?

Gold standard after world war i, Did Germany ever go back on the Gold Stand...

Did Germany ever go back on the Gold Standard after World War I and prior to World War II? If so, what were the economic and political effects of doing so? I know it was on the Gol

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