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 long run and short run, What are long run and short run? Lon...

What are long run and short run? Long run: It is the time period wherein all inputs cannot be fixed. Short run: It is the time period within which at least one in

Major economic indicators, A. What are the major differences between capita...

A. What are the major differences between capitalism, communism, and socialism? B. Discuss the three major economic indicators and how they are indicative of our current economi

Dynamic muliplier, distinguish between state and dynamic multiplier and ill...

distinguish between state and dynamic multiplier and illusrate balanc budget theorm in hindi

How large is the money supply, Assume that the following data describe the ...

Assume that the following data describe the condition of the banking system: Total Reserves                         $200 billion Transactions Deposited          $700 billion

Budget balanced, Given a four sector economy how do you find the budget bal...

Given a four sector economy how do you find the budget balanced

Average price-earnings ratio, In a survey of 120 publicly-traded companies,...

In a survey of 120 publicly-traded companies, the average price-earnings ratio was 18.5 with a standard deviation of 8.2. When testing the hypothesis (at the 5% level of significan

Anova data analytical approach, This assignment lets you explore a quasi-ex...

This assignment lets you explore a quasi-experimental model using ANCOVA data analytical approach. By doing this data analysis project, you will understand a new quantitative resea

Starbucks marketing department, If Starbucks's marketing department estimat...

If Starbucks's marketing department estimates the income elasticity of demand for its coffee to be 2.9, how will the prospect of an economic bust (expected to decrease consumers' i

Money banking and finance, The analysis of the speculative demand for money...

The analysis of the speculative demand for money reveals the importance of the level of wealth. Explain this assertion in detail

Current event opportunity, Give an example of a current event opportunity c...

Give an example of a current event opportunity cost that includes graphs

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