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 is modifications to a polymer, What are three modifications to a polym...

What are three modifications to a polymer that can make it transparent? How will these modifications affect the mechanical properties of the polymer?

Explain production externality, Bob's Bee is a small boutique honey manufac...

Bob's Bee is a small boutique honey manufacturer in Texas.  Bob's neighbor is Jon's James.  The more honey Bob produces, the more jam Jon is able to produce; that is, there is

Fall in prices and increase in quantity explain, /* Style Definitions */ ...

/* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-prior

Impulse response functions, After an oil price shock was impacted upon the ...

After an oil price shock was impacted upon the other five variables in the model, many interesting results were found. I have already demonstrated that oil Granger causes i

No plans to purchase hot dogs in january, Currently you purchase 6 packages...

Currently you purchase 6 packages of hot dogs a month. You will graduate from college in December, and you will start a new job in January. You have no plans to purchase hot dogs i

Explain about the elasticity and total revenue, Explain about the elasticit...

Explain about the elasticity and total revenue. Elasticity and Total Revenue: a. When demand for a good is elastic, a raise in price decreases total revenue. Then Sales effe

Cost to heat our homes and businesses, Use the laws of supply and demand to...

Use the laws of supply and demand to explain why the cost to heat our homes and businesses goes up in the winter time. Be sure to explain your answer fully. At least two paragraphs

Concept of preference - utility function, Concept of Preference, Utility Fu...

Concept of Preference, Utility Function: Concept of Preference, Utility Function and Indifference Curve  Consumer preference ('R') specified by the above axioms can be represe

What do you mean by gross domestic product, Q. What do you mean by Gross do...

Q. What do you mean by Gross domestic product? Perhaps the most significant concept in macroeconomics is Gross Domestic Product (GDP): Gross Domestic Product (

Explain the multiplier effect with example, Explain the multiplier effect w...

Explain the multiplier effect with example Deposits and loans in banks give rise to an important multiplier effect. We use a simple example to illustrate this effect. Consider

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