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

.Exam Question, If a country allows trade and, for a certain good, the dome...

If a country allows trade and, for a certain good, the domestic price without trade is lower than the world price. A) the country will be an exporter of the good. B) the country

World trade organization is a successor organization, The World Trade Organ...

The World Trade Organization is a successor organization to the A.United Nations. B.World Bank. C.International Court of Justice. D. GATT.

Calculate competitive equilibrium quantity, Assume a competitive industry w...

Assume a competitive industry with two hospitals. The hospitals compete in price (such that P = MC ), face the inverse demand curve =10 - Q , and have a constant marginal cost of

Illustrate biological effects of patulin, Q. Illustrate biological effects ...

Q. Illustrate biological effects of Patulin? Biological activity: Patulin has an acute oral LD 50 in rodents of about 30-50 mg/kg and has been shown to be teratogenic, immunot

Determine about the inflation rate, Determine about the Inflation rate ...

Determine about the Inflation rate For many central banks, this is the variable they are mostly interested in controlling. For all central banks, it is an important variabl

Subsidizing the price of milk, "Subsidizing the price of milk or other agri...

"Subsidizing the price of milk or other agricultural products is not very expensive considering how many consumers there are in the United States. Therefore, there is little harmfu

Determine the problems there with consumer price index, Determine the Probl...

Determine the Problems evolved with Consumer Price Index To illustrate problems involved in calculating CPI we consider MP3 players. If you measure average price of MP3 players

#title.homework help, 1) Why does the adoption of Keynesian economics come ...

1) Why does the adoption of Keynesian economics come out of the Great Depression? 1) Why does the adoption of Keynesian economics come out of the Great Depression? 2) What will ha

External Economies of Scale, Why might external economies of scale be of in...

Why might external economies of scale be of interest to developing countries?

Describe an algorithm which gives initial amount , This problem involves th...

This problem involves the question of computing change for a given coin system. A coin system is defined to be a sequence of coin values v1 (a) Let c ≥ 2 be an integer constant

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