Essentials of Modern Business Statistics with Microsoft Office Excel (Book Only)

7th Edition

ISBN: 9781337298353

Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams

Publisher: South-Western College Pub

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

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Textbook Question

Chapter 7.5, Problem 21E

The average full-sized front-loading Energy Star clothes washer uses 15 gallons of water per load (greenbuildingadvisor.com, December 4, 2015). Assume that the population standard deviation for the number of gallons of water used to wash a load by these machines is 3.0.

What is the probability that a random sample of 90 loads washed in a full-sized front-loading Energy Star clothes washer will provide a sample mean gallons of water used that is within one-half gallon of the population mean of 15 gallons?
What is the probability that a random sample of 50 loads washed in a full-sized front-loading Energy Star clothes washer will provide a sample mean gallons of water used that is at least three-quarters of a gallon greater than the population mean of 15 gallons?
What is the probability that a random sample of 75 loads washed in a full-sized front-loading Energy Star clothes washer will provide a sample mean gallons of water used that is no more than one-quarter of a gallon less than the population mean of 15 gallons?

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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Chapter 7.5, Problem 20E

Chapter 7.5, Problem 22E

Chapter 7 Solutions

Essentials of Modern Business Statistics with Microsoft Office Excel (Book Only)

Ch. 7.2 - Consider a finite population with five elements...Ch. 7.2 - The 2012 American League consists of 14 baseball...Ch. 7.3 - The following data are from a simple random...Ch. 7.3 - Morningstar publishes ratings data on 1208 company...Ch. 7.3 - Prob. 13E Ch. 7.5 - Suppose a random sample of size 50 is selected...Ch. 7.5 - The average full-sized front-loading Energy Star...Ch. 7.5 - Prob. 22E Ch. 7.5 - Prob. 25E Ch. 7.6 - A random sample of size 100 is selected from a...

Ch. 7.6 - The Wall Street Journal reported that the age at...Ch. 7.6 - Thirty-six percent of all Americans drink bottled...Ch. 7.6 - The Grocery Manufacturers of America reported that...Ch. 7.8 - Consider the Spontanversation sampling problem for...Ch. 7 - A researcher reports survey results by stating...Ch. 7 - Advertisers contract with Internet service...Ch. 7 - Marion Dairies Last year Marion Dairies decided to...Ch. 7 - Marion Dairies Last year Marion Dairies decided to...Ch. 7 - Marion Dairies Last year Marion Dairies decided to...

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Solution Summary: The author calculates the probability that randomly chosen 90 loads would be providing the sample mean that is lying at least 3-quarters of a gallon above the mean of the population of 15 gallons.

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