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

Mec, Lucas’ point of view, what are the limitations of the Keynesian model?...

Lucas’ point of view, what are the limitations of the Keynesian model? What improvements does he suggest?

Monetary policy, Let us now see a bit more closely how monetary policy work...

Let us now see a bit more closely how monetary policy works. See Figure Figure  The initial equilibrium at point E is on the initial LM schedule that corresponds to a

Market structure, Ask question #Minimum 100 words accepWith aid of evidence...

Ask question #Minimum 100 words accepWith aid of evidence in the given article, comprehensively discuss the market structure in the South African mobile telecommunications industry

Goods services will be produced and sold in the us, Who decides what goods ...

Who decides what goods services will be produced and sold in the US? Ans) It is mostly the American consumer. The US government also plays a big role in the nation's economy, co

Estimate the equation which relates the equilibrium price, The inhabitants ...

The inhabitants of Fantasia live for two periods, 0 and 1. They consume a nonrenewable resource called Fantasium in each period. Fantasium has to be extracted from the ground and t

OPEN ECONOMY, EXPLAIN THE 5 SECTOR MODEL (OPEN ECONOMY) IN INCOME DETERMINA...

EXPLAIN THE 5 SECTOR MODEL (OPEN ECONOMY) IN INCOME DETERMINATION

Define sunk costs-fixed costs-economies of scale, Address the following iss...

Address the following issues concerning technological and strategic barriers to entry. (a) Explain the role of economies of scale and (long run) fixed costs as technological bar

Marginal tax rates imposed on individuals, Compared with the situation befo...

Compared with the situation before 1981, the marginal tax rates imposed on individuals and families with high incomes are now lower. What was the top marginal personal income tax r

Inflation unemployment trade off under adaptive expectations, Explain how i...

Explain how inflation unemployment trade off is not feasible under adaptive expectations?

Standard deviation for sample bills, Suppose the country club bills based o...

Suppose the country club bills based on a sample of 4 members are: 383, 1,051, 637, 928. What is the standard deviation for this sample of bills? (please round your answer to 1 dec

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