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

What are the important tools to consider monetary policy, What are the impo...

What are the important tools to consider Monetary Policy? Important tools to consider Monetary Policy: a. What the money demand curve is b. Why the liquidity preference m

Calculate variable unit costs and total annual costs, How do you calculate ...

How do you calculate variable unit costs and total annual costs? Ans) Annual units sold, 1000. Raw materials yearly cost 650. Building rent yearly cost 9000. If sales volume enh

Unemployment, critically analyse the ways at which the govement of zimbabwe...

critically analyse the ways at which the govement of zimbabwe has put in place to address unequal employment opportunitiesbetween men andwomen

What are forms of price ceiling to lead inefficiency, What are forms of pri...

What are forms of price ceiling to lead inefficiency? Price ceilings frequently lead to inefficiency into the forms of: a. Ineffective allocation to consumers b. Wasted r

Microsoft case study, 2.2 "Our business model works even if all internet so...

2.2 "Our business model works even if all internet software is free ....... We are still selling operating systems. What does Netscape''s business model look like? Not very good."

Credit, How credit is created or the creation of credit

How credit is created or the creation of credit

Taxes and government expenditures were constant, If taxes and government ex...

If taxes and government expenditures were constant and did not vary with income, then: A. passive deficits would increase. B. structural deficits would increase. C. passive deficit

Tax credit, Suppose that an investment tax credit is stated to be temporary...

Suppose that an investment tax credit is stated to be temporary in nature, and the credit will be 10% on newly acquired capital (investment) equipment and will last just one year o

Consumer price index, i need help comparing real values in the base year do...

i need help comparing real values in the base year dollars

Deadweight loss created by this monopoly, The market for quits is initially...

The market for quits is initially competitive and the market demand is: P=400-0.4QD. The Combined marginal costs of the firms in the quit industry are: MC=50+0.6Q. a. Draw the

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