Bundle: Introduction to Statistics and Data Analysis, 5th + WebAssign Printed Access Card: Peck/Olsen/Devore. 5th Edition, Single-Term

5th Edition

ISBN: 9781305620711

Author: Roxy Peck, Chris Olsen, Jay L. Devore

Publisher: Cengage Learning

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Textbook Question

Chapter 9.3, Problem 45E

The article “The Association Between Television Viewing and Irregular Sleep Schedules Among Children Less Than 3 Years of Age” (Pediatrics [2005]: 851–856) reported the accompanying 95% confidence intervals for average TV viewing time (in hours per day) for three different age groups.

Chapter 9.3, Problem 45E, The article The Association Between Television Viewing and Irregular Sleep Schedules Among Children

a. Suppose that the sample sizes for each of the three age group samples were equal. Based on the given confidence intervals, which of the age group samples had the greatest variability in TV viewing time? Explain your choice. (Hint: Consider the formula for the confidence interval.)
b. Now suppose that the sample standard deviations for the three age group samples were equal, but that the three sample sizes might have been different. Which of the three age-group samples had the largest sample size? Explain your choice.
c. The interval (0.768, 1.032) is either a 90% confidence interval or a 99% confidence interval for the mean TV viewing time calculated using the sample data for children less than 12 months old. Is the confidence level for this interval 90% or 99%? Explain your choice.

Expert Solution & Answer

Chapter 9 Solutions

Bundle: Introduction to Statistics and Data Analysis, 5th + WebAssign Printed Access Card: Peck/Olsen/Devore. 5th Edition, Single-Term

Ch. 9.1 - Three different statistics are being considered...Ch. 9.1 - a. Why is an unbiased statistic generally...Ch. 9.1 - Prob. 3E Ch. 9.1 - Prob. 4E Ch. 9.1 - Each person in a random sample of 20 students at a...Ch. 9.1 - Suppose that each of 935 smokers received a...Ch. 9.1 - Given below are the sodium contents (in mg) for...Ch. 9.1 - A random sample of n = 12 four-year-old red pine...Ch. 9.1 - A random sample of 10 houses heated with natural...Ch. 9.2 - Prob. 10E

Ch. 9.2 - The formula used to calculate a large-sample...Ch. 9.2 - Prob. 12E Ch. 9.2 - Discuss how each of the following factors affects...Ch. 9.2 - Prob. 14E Ch. 9.2 - Based on data from a survey of 1200 randomly...Ch. 9.2 - Prob. 16E Ch. 9.2 - If a hurricane was headed your way, would you...Ch. 9.2 - Prob. 18E Ch. 9.2 - Prob. 19E Ch. 9.2 - Prob. 20E Ch. 9.2 - Prob. 21E Ch. 9.2 - Prob. 22E Ch. 9.2 - Prob. 23E Ch. 9.2 - Prob. 24E Ch. 9.2 - Prob. 25E Ch. 9.2 - Prob. 26E Ch. 9.2 - Prob. 27E Ch. 9.2 - The Gallup Organization conducts an annual survey...Ch. 9.2 - The article Hospitals Dispute Medtronic Data on...Ch. 9.2 - Prob. 30E Ch. 9.2 - A discussion of digital ethics appears in the...Ch. 9.2 - In spite of the potential safety hazards, some...Ch. 9.2 - Prob. 33E Ch. 9.3 - Given a variable that has at distribution with the...Ch. 9.3 - The formula used to calculate a confidence...Ch. 9.3 - USA TODAY reported that the average amount of...Ch. 9.3 - Samples of two different models of cars were...Ch. 9.3 - Prob. 38E Ch. 9.3 - In a study of academic procrastination, the...Ch. 9.3 - Medical research has shown that repeated wrist...Ch. 9.3 - Prob. 41E Ch. 9.3 - Prob. 42E Ch. 9.3 - Suppose that a random sample of 50 bottles of a...Ch. 9.3 - Prob. 44E Ch. 9.3 - The article The Association Between Television...Ch. 9.3 - Prob. 46E Ch. 9.3 - Because of safety considerations, in May 2003 the...Ch. 9.3 - Example 9.3 gave the following airborne times (in...Ch. 9.3 - Prob. 49E Ch. 9.3 - Five students visiting the student health center...Ch. 9.3 - The Bureau of Alcohol, Tobacco, and Firearms...Ch. 9.3 - The formula described in this section for...Ch. 9.4 - The following quote is from the article Credit...Ch. 9.4 - Authors of the news release titled Major Gaps...Ch. 9.4 - The paper The Curious Promiscuity of Queen Honey...Ch. 9 - Prob. 56CR Ch. 9 - Prob. 57CR Ch. 9 - Prob. 58CR Ch. 9 - Prob. 59CR Ch. 9 - Prob. 60CR Ch. 9 - Prob. 61CR Ch. 9 - A manufacturer of small appliances purchases...Ch. 9 - Prob. 63CR Ch. 9 - A manufacturer of college textbooks is interested...Ch. 9 - Prob. 65CR Ch. 9 - The confidence intervals presented in this chapter...Ch. 9 - Prob. 67CR Ch. 9 - The interval from 2.33 to 1.75 captures an area of...Ch. 9 - Prob. 69CR

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Solution Summary: The author identifies the age groups with the greatest variability in TV viewing time. The confidence interval will be wider for those intervals having wider variability for samples of equal sizes.

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Chapter 9 Solutions