3rd Edition

ISBN: 9780135163146

Author: Gould

Publisher: PEARSON

Concept explainers

The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of tw…

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Textbook Question

Chapter 13, Problem 30SE

Soda A StatCrunch survey was done asking what percentage of liquid intake was in the form of soda. Figure A shows the output given.

a. Figure B is a histogram of the percentage for the females. Describe the shape of the distribution of the sample, and comment on whether it would be better to compare means or medians and explain why.

b. Descriptively compare the percentage of liquid intake that was soda for men and the percentage for women. Who consumes the larger percentage of soda?

c. Assuming we have a random sample of StatCrunch users, test the hypothesis that the medians are not equal, using a significance level of 0.05.

Chapter 13, Problem 30SE, Soda A StatCrunch survey was done asking what percentage of liquid intake was in the form of soda.

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 13, Problem 29SE

Chapter 13, Problem 31SE

Chapter 13 Solutions

INTRODUCTORY STATISTICS (LOOSELEAF)

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Solution Summary: The author analyzes the distribution of the sample for the percentage of liquid intake by females and determines whether it would be appropriate to compare mean or median.

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