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

Crowding out would most likely occur, Crowding out would most likely occur ...

Crowding out would most likely occur when: A. the Congress enacts budget cuts to balance the budget. B. workers lose jobs as a result of anti-inflationary fiscal policies. C. the f

Ricardo Viner Model, How does the Ricardo Viner diagram react when once pri...

How does the Ricardo Viner diagram react when once price changes, effects on real wages, and labor allocation?

Happens with the budget constraint, Suppose that Ana is buying only 2 goods...

Suppose that Ana is buying only 2 goods: good 1 and 2. If the price of good 1 doubles and the price of good 2 drops by one third, then what happens with the budget constraint? (Ass

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

Explain about interest rate, Q. Explain about Interest rate? When you b...

Q. Explain about Interest rate? When you borrow money, you normally have to pay a fee for the loan. This fee is frequently known as interest, especially if the fee is proportio

Economies as a scope, If there are economies of scope and if the price for ...

If there are economies of scope and if the price for each product equals marginal cost, is it possible for a firm to cover all its costs? If the firm's average cost of production d

Should US laws be changed to require a shorter work week and, One constrain...

One constraint in our economy is time. As a society, we make choices about the allocation of time between work and other pursuits. In the US, most workers are eligible for overtime

Millions of americans purchase, Each day millions of Americans purchase mil...

Each day millions of Americans purchase millions of goods and services. These goods and services are generally readily available, as long as you have the necessary money to purchas

Income increases at an average annual rate, Upon taking his first job at co...

Upon taking his first job at college your Dad earns an annual salary of $38,000 and set a goal to earn $10000 per year. If his salary increases at an average annual rate of 12% how

Assigment question, Ask question #Minimum 100 wordsThe following is the inf...

Ask question #Minimum 100 wordsThe following is the information from the national income accounts for a hypothetical country: GDP

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