Essentials of Statistics for The Behavioral Sciences (MindTap Course List)
9th Edition
ISBN: 9781337098120
Author: Frederick J Gravetter, Larry B. Wallnau, Lori-Ann B. Forzano
Publisher: Cengage Learning
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Textbook Question
Chapter 6, Problem 20P
A recent report indicates that 2-year-old children from well-educated suburban families watched an average of μ = 60 minutes of television each day. Assuming that the distribution of television-watching times is normal with a standard deviation of σ = 25 minutes, find each of the following proportions.
- a. What proportion of 2-year-old children watch more than 2 hours of television each day?
- b. What proportion of 2-year-old children watch less than 30 minutes a day?
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Chapter 6 Solutions
Essentials of Statistics for The Behavioral Sciences (MindTap Course List)
Ch. 6.1 - An introductory psychology class with n = 44...Ch. 6.1 - A jar contains 10 red marbles and 20 blue marbles....Ch. 6.1 - Random sampling requires sampling with...Ch. 6.2 - What is the probability of randomly selecting a...Ch. 6.2 - In a normal distribution, what z-score value...Ch. 6.2 - In a normal distribution, what z-score value...Ch. 6.3 - The population of SAT scores forms a normal...Ch. 6.3 - A normal distribution has = 100 and = 20. What is...Ch. 6.3 - For a normal distribution with = 70 and a 10,...Ch. 6.4 - Which of the following accurately describes a...
Ch. 6.4 - For a normal distribution with = 60 and = 10,...Ch. 6.4 - Prob. 3LCCh. 6 - What are the two requirements for a random sample?Ch. 6 - Define sampling with replacement and explain why...Ch. 6 - Around Halloween each year the grocery store sells...Ch. 6 - A psychology class consists of 28 males and 52...Ch. 6 - Draw a vertical line through a normal distribution...Ch. 6 - Draw a vertical line through a normal distribution...Ch. 6 - Draw a vertical line through a normal distribution...Ch. 6 - Find each of the following probabilities for a...Ch. 6 - What proportion of a normal distribution is...Ch. 6 - Find each of the following probabilities for a...Ch. 6 - Find the z-score location of a vertical line that...Ch. 6 - Find the z-score boundaries that separate a normal...Ch. 6 - A normal distribution has a mean of . = 90 and a...Ch. 6 - A normal distribution but a name of = 60 and a...Ch. 6 - For a normal distribution with a mean of = 85 and...Ch. 6 - In 2014 the New York Yankee had a team batting...Ch. 6 - IQ test scores are standardized to produce a...Ch. 6 - The distribution of scores on the SAT it...Ch. 6 - According to a recent report, the average American...Ch. 6 - A recent report indicates that 2-year-old children...Ch. 6 - A report in 2010 indicates that Americans between...Ch. 6 - Seattle, Washington, averages = 34 inches of...
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