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 do you mean by patulin, Q. What do you mean by Patulin? It is a to...

Q. What do you mean by Patulin? It is a toxic and antibiotic metabolite produced by several species of Penicillin, Aspergillus and Paeciliomyces but the most important in the c

Data and methodology - macroeconomy analysis, In order to estimate the VAR,...

In order to estimate the VAR, I have firstly to specify the data which will be analysed. As it is my aim to observe the correlations between oil prices and key macroeconomic variab

Inftaion, what is the cause of inflation in PNG

what is the cause of inflation in PNG

Federal funds rate and supply and demand analysis, If banks expect an unusu...

If banks expect an unusually large increase in withdraws from checking deposit accounts in the near future, what would happen to the federal funds rate, borrowed reserves and nonbo

International trade, developing countries benefit through international tra...

developing countries benefit through international trade from developed countries

Define the term- wages and income, Define the term- Wages and income R...

Define the term- Wages and income Remember that by wage we mainly mean what you receive for working one hour, whereas income is the total revenue from all sources over a longe

Fiscal Policy, When is a balanced budget presented?

When is a balanced budget presented?

Determination of C - Im and NT, Once Y is determined, almost all of the oth...

Once Y is determined, almost all of the other variables are determined since they are either exogenous or they depend on Y. From Y we can determine C by consumption function, I m

Simultaneous determination of y in the is-lm model, Q. Simultaneous determi...

Q. Simultaneous determination of Y in the IS-LM model? Simultaneous determination of Y and R in the IS-LM model   By combining IS curve and LM curve, we can graphically e

Upper bound of the confidence interval, A stock investor would like to have...

A stock investor would like to have an idea concerning the average return of stocks that are traded on a certain exchange. In a sample of 99 stocks, the average return was 9 percen

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