3rd Edition

ISBN: 9780135163146

Author: Gould

Publisher: PEARSON

Concept explainers

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Textbook Question

Chapter 13, Problem 29SE

Happiness A StatCrunch survey of happiness measured the happiness level for males and females. Each person selected a number from 1 (lowest) to 100 (highest) to measure her or his level of happiness. Figure A shows the output for a Mann-Whitney test to compare the median happiness level for males and females.

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

b. Compare the sample medians descriptively.

c. Assuming we have a random sample of male and female users of Stat-Crunch, test the hypothesis that the typical happiness level (as measured by the median) is different for males and females. Use a significance level of 0.05.

Chapter 13, Problem 29SE, Happiness A StatCrunch survey of happiness measured the happiness level for males and females. Each , example 1

Chapter 13, Problem 29SE, Happiness A StatCrunch survey of happiness measured the happiness level for males and females. Each , example 2

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 28SE

Chapter 13, Problem 30SE

Chapter 13 Solutions

INTRODUCTORY STATISTICS (LOOSELEAF)

Ch. 13 - What is the fundamental condition required for...Ch. 13 - In what situations are nonparametric statistics...Ch. 13 - In addition to random samples, what other...Ch. 13 - What summary statistics are best used to report...Ch. 13 - Prob. 5SE Ch. 13 - Prob. 6SE Ch. 13 - Prob. 7SE Ch. 13 - Log Transforms a. Find the log (base 10) of each...Ch. 13 - Prob. 9SE Ch. 13 - Prob. 10SE

Ch. 13 - Prob. 11SE Ch. 13 - Morning Routine A statistics student conducted a...Ch. 13 - Exercise Hours A statistics student was interested...Ch. 13 - Television Viewing A Nielsen poll asked people the...Ch. 13 - Lead Exposure (Example 3) Excessive lead levels...Ch. 13 - Juvenile Delinquents Dr. Kirkland R. Gable (in...Ch. 13 - The Stroop Effect Suppose you had to identify the...Ch. 13 - Reading Material on Colored Paper In the past,...Ch. 13 - Males’ Pulse Rates Students in a statistics class...Ch. 13 - Females’ Pulse Rates Refer to exercise 13.19. This...Ch. 13 - Ages of Brides and Grooms A random sample of the...Ch. 13 - Textbook Prices A student was interested in...Ch. 13 - Meat-Eating Behavior (Example 4) A researcher was...Ch. 13 - Credit Card Debt A statistics student who was...Ch. 13 - Prob. 25SE Ch. 13 - Sleep Typically, do men and women sleep different...Ch. 13 - Cell Phone Bills Cell phone bills (rounded to the...Ch. 13 - Weights of Athletes Data were collected on the...Ch. 13 - Happiness A StatCrunch survey of happiness...Ch. 13 - Soda A StatCrunch survey was done asking what...Ch. 13 - Sports and Extraversion (Example 5) Are students...Ch. 13 - Happiness Are women happier than men? A StatCrunch...Ch. 13 - College Students and Credit Card Debt In exercise...Ch. 13 - Soda Does soda constitute a larger part of the...Ch. 13 - Rainfall In a well-known study on the effects of...Ch. 13 - Rainfall Refer to exercise 13.35, which discussed...Ch. 13 - Randomization Exercise 13.35 describes a...Ch. 13 - Randomization Exercise 13.35 describes a...Ch. 13 - Prob. 39CRE Ch. 13 - For exercises 13.39 through 13.46, choose from the...Ch. 13 - Prob. 41CRE Ch. 13 - For exercises 13.39 through 13.46, choose from the...Ch. 13 - Prob. 43CRE Ch. 13 - Prob. 44CRE Ch. 13 - For exercises 13.39 through 13.46, choose from the...Ch. 13 - For exercises 13.39 through 13.46, choose from the...Ch. 13 - Ice Cream Cones McDonald’s claims that its ice...Ch. 13 - Average Body Temperatures Many people believe that...Ch. 13 - Contacting Mom Random samples of 30 professors of...Ch. 13 - 13.50 through 13.54 Texts Sent and Received...Ch. 13 - 13.50 through 13.54 Texts Sent and Received...Ch. 13 - 13.50 through 13.54 Texts Sent and Received...Ch. 13 - 13.50 through 13.54 Texts Sent and Received...Ch. 13 - 13.50 through 13.54 Texts Sent and Received...Ch. 13 - Geometric Mean The dotplot shows the number of...Ch. 13 - Looking at the data about contacting mom (exercise...Ch. 13 - Resampling Moms We performed a randomization test...Ch. 13 - Prob. 58CRE Ch. 13 - Prob. 59CRE Ch. 13 - Prob. 60CRE

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Solution Summary: The author explains that the distribution of the sample is left skewed and it would be appropriate to compare medians.

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