17th Edition

ISBN: 9781259924163

Author: Lind

Publisher: MCGRAW HILL BOOK COMPANY

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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 10, Problem 3SR

The mean life of a battery used in a digital clock is 305 days. The lives of the batteries follow the normal distribution. The battery was recently modified to last longer. A sample of 20 of the modified batteries had a mean life of 311 days with a standard deviation of 12 days. Did the modification increase the mean life of the battery?

(a) State the null hypothesis and the alternate hypothesis.
(b) Show the decision rule graphically. Use the .05 significance level.
(c) Compute the value of t. What is your decision regarding the null hypothesis? Briefly summarize your results.

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 10, Problem 8E

Chapter 10, Problem 9E

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Chapter 10 Solutions

EBK STATISTICAL TECHNIQUES IN BUSINESS

Ch. 10 - Heinz, a manufacturer of ketchup, uses a...Ch. 10 - Prob. 2SR Ch. 10 - For Exercises 14, answer the questions: (a) Is...Ch. 10 - Prob. 2E Ch. 10 - Prob. 3E Ch. 10 - For Exercises 14, answer the questions: (a) Is...Ch. 10 - For Exercises 58: (a) State the null hypothesis...Ch. 10 - For Exercises 58: (a) State the null hypothesis...Ch. 10 - For Exercises 58: (a) State the null hypothesis...Ch. 10 - For Exercises 58: (a) State the null hypothesis...

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Solution Summary: The author states the null hypothesis and the alternative hypothesis, which states that the mean life of a digital clock is more than 305 days.

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Chapter 10 Solutions