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

Economic luxury and an economic necessity, What is the difference between a...

What is the difference between an economic luxury and an economic necessity? Ans) An economic luxury is wasting land on pools huge garden, etc. An economic requirement is what y

Subsequent withdrawals increase, What is the amount of five equal annual de...

What is the amount of five equal annual deposits that can provide five annual withdrawals, where a first withdrawal of $1500 is made at the end of year six and subsequent withdrawa

Optimal order size, A major component of the costs of many large firms  is ...

A major component of the costs of many large firms  is the cost associated with ordering and holding inventory. If the yearly demand for the good is  D and the size of each order p

How to evaluate total savings, Q. How to evaluate total savings? Total...

Q. How to evaluate total savings? Total savings Total savings S(r) depends positively on the real interest rate Remember that total saving

Describe the keynes motivation, Q. Describe the Keynes motivation? Key...

Q. Describe the Keynes motivation? Keynes' motivation: In good times, when Y is high (above its trend), national income is high (above it trend). Consumers will take this opp

What do you mean by the long run outcome, Imagine a firm with the same cost...

Imagine a firm with the same cost structure but in each of the four market structures: Competitive, Monopolistically Competitive, Oligopoly, and a Monopoly. Using the concepts of c

Quality of health care, Explain how changes in the quality of health care w...

Explain how changes in the quality of health care will influence the demand for care.

Firm‘s lowest average cost, If the firm‘s lowest average cost is $52 and th...

If the firm‘s lowest average cost is $52 and the corresponding average variable cost is $26, what does it pay a perfectly competitive firm to do if • The market price is $51?

What is the law of comparative advantage, What is The law of comparative ad...

What is The law of comparative advantage The law of comparative advantage, though, suggests that it would be unwise of UK economy to try to replicate German model. First German

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