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

Why gdp is determined only by aggregate demand, Q. Why GDP is determined on...

Q. Why GDP is determined only by aggregate demand? Note that we haven't said anything about the aggregate supply so far. In order to justify why GDP is determined only by aggre

Four different measures of GDP, Four different measures of GDP Using ci...

Four different measures of GDP Using circular flow model we see that there are 4 equivalent ways of measuring GDP:  Using the definition: market value of all finished goo

Physiocrats spoke of the natural order, Consider the following: "The physio...

Consider the following: "The physiocrats spoke of the natural order and favored laissez-faire yet strongly supported the absolute authority of the monarchy." Analyze this supposed

Introduction of Macroeconomics, Macroeconomics We have explained severa...

Macroeconomics We have explained several concepts and Macroeconomic Aggregates which form the basic terminology of macroeconomic analysis. Like other empirical sciences, econom

Product development project, What is the primary difference between a resea...

What is the primary difference between a research project and a product development project?

State in detail the macroeconomic policy, State the macroeconomic policy ...

State the macroeconomic policy The view that macroeconomic policy must only focus on supply-side performance of economy and should ignore management of the demand side is an ex

Rate of growth, Rate of Growth  Every country desires economic growth. ...

Rate of Growth  Every country desires economic growth. A country's economic performance is often judged on the basis of - among other things - the rates of growth it has manage

Income and expedenture, Illustrate the circular flow of income and expendit...

Illustrate the circular flow of income and expenditure according to their models ( classical and keynesian)

Robert''s new way vacuum cleane, Robert's New Way Vacuum Cleaner Company is...

Robert's New Way Vacuum Cleaner Company is a newly started small business that produces vacuum cleaners and belongs to a monopolistically competitive market. Its demand curve for t

Wages, Subsistence theory of wage determination

Subsistence theory of wage determination

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