Statistics: The Art and Science of Learning from Data (4th Edition)

4th Edition

ISBN: 9780321997838

Author: Alan Agresti, Christine A. Franklin, Bernhard Klingenberg

Publisher: PEARSON

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.

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Textbook Question

Chapter 8, Problem 75CP

Streaming A Harris Poll of 2300 U.S. adults surveyed online in April 2014 reports that 43% regularly watch television shows through streaming. (Source: “Cable Is King but Streaming Stands Strong When It Comes to Americans’ TV Viewing Habits,” available at harrisinteractive.com)

a. Find a 95% confidence interval and interpret it in context.
b. Would a 99% confidence interval result in a wider or narrower interval? Explain.
c. If the survey had found the 43% streaming based on a survey including 5000 adults (instead of 2300), would the interval be wider or narrower compared to the one in part a? Explain.

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Chapter 8, Problem 74CP

Chapter 8, Problem 76CP

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Chapter 8 Solutions

Statistics: The Art and Science of Learning from Data (4th Edition)

Ch. 8.1 - Health care A study dealing with health care...Ch. 8.1 - Video on demand A recent study from Nielsen...Ch. 8.1 - Projecting winning candidate News coverage during...Ch. 8.1 - Believe in hell? Using the General Social Survey...Ch. 8.1 - Government spying In 2014, news reports worldwide...Ch. 8.1 - Game apps The Google Play app store for...Ch. 8.1 - Nutrient effect on growth rate Researchers are...Ch. 8.1 - Believe in heaven? When a GSS asked 1326 subjects,...Ch. 8.1 - Feel lonely often? The GSS has asked On how many...Ch. 8.1 - CI for loneliness Refer to the previous exercise....

Ch. 8.2 - Putin A Gallup poll of 2000 Russians taken between...Ch. 8.2 - Flu shot In a clinical study (the same as...Ch. 8.2 - How green are you? When the 2000 GSS asked...Ch. 8.2 - Make industry help environment? When the 2006 GSS...Ch. 8.2 - Favor death penalty In the 2012 General Social...Ch. 8.2 - Oppose death penalty Refer to the previous...Ch. 8.2 - Stem cell research A Harris poll of a random...Ch. 8.2 - z-score and confidence level Which z-score is used...Ch. 8.2 - Believe in ghosts A Harris poll of a random sample...Ch. 8.2 - Stem cell research and religion In Exercise 8.18,...Ch. 8.2 - Fear of breast cancer A recent survey of 1000...Ch. 8.2 - Chicken breast In a 2014 Consumer Reports article...Ch. 8.2 - Same-sex marriage A national survey by the Pew...Ch. 8.2 - Exit poll predictions A national television...Ch. 8.2 - Exit poll with smaller sample In the previous...Ch. 8.2 - Simulating confidence intervals Repeat the...Ch. 8.2 - Simulating confidence intervals with poor coverage...Ch. 8.3 - Females ideal number of children The 2012 General...Ch. 8.3 - Males ideal number of children Refer to the...Ch. 8.3 - Using t-table Using Table B, the web app, software...Ch. 8.3 - Anorexia in teenage girls A study6 compared...Ch. 8.3 - Talk time on smartphones One feature smartphone...Ch. 8.3 - Heights of seedlings Exercise 8.7 reported heights...Ch. 8.3 - Buy it now Example 6 mentioned closing prices for...Ch. 8.3 - Time spent on e-mail When the GSS asked n = 1050...Ch. 8.3 - Grandmas using e-mail For the question about...Ch. 8.3 - Prob. 38PB Ch. 8.3 - Prob. 39PB Ch. 8.3 - Political views The General Social Survey asks...Ch. 8.3 - Prob. 41PB Ch. 8.3 - Prob. 42PB Ch. 8.3 - Effect of confidence level Find the margin of...Ch. 8.3 - Prob. 44PB Ch. 8.3 - Number of children For the question, How many...Ch. 8.3 - Prob. 46PB Ch. 8.4 - South Africa study The researcher planning the...Ch. 8.4 - Binge drinkers A study at the Harvard School of...Ch. 8.4 - Prob. 49PB Ch. 8.4 - Prob. 50PB Ch. 8.4 - Prob. 51PB Ch. 8.4 - Farm size An estimate is needed of the mean...Ch. 8.4 - Prob. 53PB Ch. 8.4 - Prob. 54PB Ch. 8.4 - Prob. 55PB Ch. 8.4 - Prob. 56PB Ch. 8.4 - Prob. 57PB Ch. 8.4 - Prob. 58PB Ch. 8.5 - Why bootstrap? Explain the purpose of using the...Ch. 8.5 - Estimating variability Refer to Example 11 about...Ch. 8.5 - Bootstrap interval for the mean In 2014, the...Ch. 8.5 - Prob. 62PB Ch. 8 - Unemployed college grads The U.S Bureau of the...Ch. 8 - Prob. 64CP Ch. 8 - Prob. 65CP Ch. 8 - Born again A poll of a random sample of n = 2000...Ch. 8 - Life after death The variable POSTLIFE in the 2012...Ch. 8 - Prob. 68CP Ch. 8 - Prob. 69CP Ch. 8 - Prob. 70CP Ch. 8 - Prob. 71CP Ch. 8 - Wife supporting husband Consider the statement...Ch. 8 - Legalize marijuana? The General Social Survey has...Ch. 8 - Prob. 74CP Ch. 8 - Streaming A Harris Poll of 2300 U.S. adults...Ch. 8 - Prob. 76CP Ch. 8 - Prob. 77CP Ch. 8 - Grandpas using e-mail When the GSS asked in 2012,...Ch. 8 - Prob. 79CP Ch. 8 - Prob. 80CP Ch. 8 - Fuel efficiency The government website...Ch. 8 - Prob. 82CP Ch. 8 - Prob. 83CP Ch. 8 - Prob. 84CP Ch. 8 - Prob. 85CP Ch. 8 - Prob. 86CP Ch. 8 - Prob. 87CP Ch. 8 - Revisiting mountain bikes Use the Mountain Bike...Ch. 8 - Prob. 89CP Ch. 8 - Prob. 90CP Ch. 8 - Prob. 91CP Ch. 8 - Prob. 92CP Ch. 8 - Working mother In response to the statement on a...Ch. 8 - Miami spring break For a trip to Miami, Florida,...Ch. 8 - Prob. 95CP Ch. 8 - Prob. 96CP Ch. 8 - Prob. 97CP Ch. 8 - Prob. 98CP Ch. 8 - Prob. 99CP Ch. 8 - Prob. 100CP Ch. 8 - Kicking accuracy A football coach decides to...Ch. 8 - Prob. 103CP Ch. 8 - Prob. 104CP Ch. 8 - Prob. 106CP Ch. 8 - Width of a confidence interval Why are confidence...Ch. 8 - Prob. 108CP Ch. 8 - Prob. 109CP Ch. 8 - Prob. 110CP Ch. 8 - Prob. 111CP Ch. 8 - Prob. 112CP Ch. 8 - Prob. 113CP Ch. 8 - Prob. 114CP Ch. 8 - Prob. 115CP Ch. 8 - Prob. 116CP Ch. 8 - Prob. 117CP Ch. 8 - Prob. 118CP Ch. 8 - Prob. 119CP Ch. 8 - Prob. 120CP Ch. 8 - Prob. 121CP Ch. 8 - Prob. 122CP Ch. 8 - Prob. 123CP Ch. 8 - Why called degrees of freedom? You know the sample...Ch. 8 - Prob. 125CP Ch. 8 - Prob. 126CP Ch. 8 - Median as point estimate When the population...

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Solution Summary: The author analyzes the 95% confidence interval for the percentage of U.S. adults who are regularly watching television shows through streaming.

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Chapter 8 Solutions