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

Purchasing power, One problem in using exchange rate when comparing GDP per...

One problem in using exchange rate when comparing GDP per capital between countries is that is fluctuates a lot. A way of avoiding dependence on exchange rate is to use purchasing

Inflation, Identify trends or other patterns in inflation within the Spanis...

Identify trends or other patterns in inflation within the Spanish economy over the last five years using quarterly data. You must include data to justify the trends described.

What is net present worth for new computer system, Kermit is considering pu...

Kermit is considering purchasing a new computer system. The purchase price is $106,430. Kermit will borrow one-fourth of the purchase price from a bank at 10 percent per year compo

What is difference between explicit cost and implicit cost, What are the di...

What are the difference between explicit cost and implicit cost? Both are concerns to Opportunity Cost and Decisions: An explicit cost is a cost which involves essentially

What is the opportunity cost of economic growth, What is the opportunity co...

What is the opportunity cost of economic growth? Opportunity cost measures the cost of an economic option within terms of the next best option foregone. The government of a

How to find nominal gdp in the current year, Consider an economy that produ...

Consider an economy that produces only three types of fruit: apples, oranges & bananas. In the base year the production & price data are as follows: Fruit

Mundel fleming model., The mundelfleming model takes the world interst rate...

The mundelfleming model takes the world interst rate r* as anexogenous variable.Let,consider what happen when this variable changes.a,what maight cause the world interest rate tori

Indiana toll road at the rate of two per minute, Automobiles arrive at the ...

Automobiles arrive at the Elkhart exit of the Indiana Toll Road at the rate of two per minute. The distribution of arrivals approximates a Poisson distribution. A) What is the prob

The core of macroeconomics, Suppose in the Republic of Madison that the reg...

Suppose in the Republic of Madison that the regulation of banking rested with the Madison Congress, including the determination of the reserve ratio. The Central Bank of Madison is

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