Elementary Statistics: Picturing the World (7th Edition)

7th Edition

ISBN: 9780134683416

Author: Ron Larson, Betsy Farber

Publisher: PEARSON

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Chapter 8.3, Problem 1TY

A shoe manufacturer claims that athletes can decrease their times in the 40-yard dash using the manufacturer’s training shoes. The 40-yard dash times of 12 randomly selected athletes are measured. After the athletes have used the shoes for 8 months, their 40-yard dash times are measured again. The times (in seconds) are listed in the table below. At α = 0.05, is there enough evidence to support the manufacturer’s claim? Assume the times are normally distributed. (Adapted from Coaches Sports Publishing)

Chapter 8.3, Problem 1TY, A shoe manufacturer claims that athletes can decrease their times in the 40-yard dash using the

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 8.2, Problem 5CS

Chapter 8.3, Problem 2TY

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Chapter 8 Solutions

Elementary Statistics: Picturing the World (7th Edition)

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Solution Summary: The author concludes that there is no evidence to support the claim that athletes can decrease their times in the 40-yard dash using the manufacturer's training shoes.

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