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

Energy infrastructure, Energy Infrastructure: Electricity is one of th...

Energy Infrastructure: Electricity is one of the main determinants of the quality of life. In India, the power sector has not kept pace with the growth in demand resulting in

Fed would cause the money supply, One alternative way to calculate the tota...

One alternative way to calculate the total change in money supply when the Fed injects money into the economy or takes away money from the economy is the amount of money injected o

Analyze the effects of discrimination in labor markets, To analyze the effe...

To analyze the effects of discrimination in labor markets, use supply and demand curves for labor, with the demand curves representing the value of the marginal product, show the e

What are the various uses for break-even analysis, Such analysis permits th...

Such analysis permits the firm to determine at what level of operations it will break even (earn zero profit) and to discover the relationship among volume, costs, and profits. It

Calculate private market equilibrium, Consider the following Marginal Priva...

Consider the following Marginal Private Cost (MPC), Marginal Social Cost (MSC) and market demand curves. These curves relate to a market for a product, the production of which gene

U.s. department of agriculture, The U.S. Department of Agriculture, nass.us...

The U.S. Department of Agriculture, nass.usda.gov, publishes charts on the prices of farm products. Go to the USDA home page and select Charts and Maps and then Agricultural Prices

What are the potential advantages of economic growth, What are the potentia...

What are the potential advantages of economic growth? The potential advantages of growth include • More goods and services are accessible to satisfy more want and requireme

Nursing home has a book value, Beverly enterprises owns a nursing home that...

Beverly enterprises owns a nursing home that is currently earning $2.0 million in cash flow on an annual basis, but this amount is expected to drop in the future. The nursing home

GDP, BENEFITS OF GDP

BENEFITS OF GDP

Neo-classical thinking on growth, Neo-classical thinking on growth: Neo...

Neo-classical thinking on growth: Neo-classical  thinking  on  growth  is  owed  to  the Robert  Solow  whose  exogenous  growth models in the of the mid-20th century remained

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