2nd Edition

ISBN: 9780321978271

Author: Robert Gould, Colleen N. Ryan

Publisher: PEARSON

Concept explainers

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 52SE

Which Method? A proponent of a new proposition on a ballot wants to know the population percentage of people who support the bill. Suppose a poll is taken, and 580 out of 1000 randomly selected people support the proposition. Should the proponent use a hypothesis test or a confidence interval to answer this question? Explain. If it is a hypothesis test, state the hypotheses and find the test statistic, p-value, and conclusion. Use a 5 % significance level. If a confidence interval is appropriate, find the approximate 95 % confidence interval. In both cases, assume that the necessary conditions have been met.

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Chapter 8, Problem 51SE

Chapter 8, Problem 53SE

Chapter 8 Solutions

Introductory Statistics (2nd Edition)

Ch. 8 - Choose one of the answers given. The null...Ch. 8 - Choose one of the answers in each case. In...Ch. 8 - Boot Camp (Example 1) Suppose an experiment is...Ch. 8 - Scrubs A research hospital tries a new antibiotic...Ch. 8 - Magic A magician claims he can cause a coin to...Ch. 8 - Water A friend is tested to see whether he can...Ch. 8 - Heart Attack Prevention A new drug is being tested...Ch. 8 - Stroke Survival Rate The proportion of people who...Ch. 8 - Coin Flips (Example 2) A coin is flipped 30 times...Ch. 8 - Die Rolls You roll a six-sided die 30 times and...

Ch. 8 - Prob. 11SE Ch. 8 - Multiple-Choice Test A teacher is giving an exam...Ch. 8 - Dropouts According to Time magazine (June 11,...Ch. 8 - Prob. 14SE Ch. 8 - Boot Camp, Again (Example 4) Refer to Exercise...Ch. 8 - Prob. 16SE Ch. 8 - Coke versus Pepsi (Example 5) Suppose you are...Ch. 8 - St. Louis Jury Pool St. Louis County is 24 African...Ch. 8 - Coke vs. Pepsi (Example 6) Suppose you are testing...Ch. 8 - Prob. 20SE Ch. 8 - Cheating? A professor creates two versions of a 20...Ch. 8 - Guessing A 20-question multiple choice quiz has...Ch. 8 - Dreaming (Example 7) A 2003 study of dreaming...Ch. 8 - Age Discrimination About 30 of the population in...Ch. 8 - Marriage Obsolete (Example 8) When asked whether...Ch. 8 - Prob. 26SE Ch. 8 - Coke versus Pepsi A taste test is done to see...Ch. 8 - Seat Belts Suppose we are testing people to see...Ch. 8 - Sleep Walking (Example 9) According to Time...Ch. 8 - Prob. 30SE Ch. 8 - Sleep Walking, Again (Example 10) According to...Ch. 8 - Women CEOs, Again the percentage of female CEOs in...Ch. 8 - p-Values For each graph, indicate whether the...Ch. 8 - p-Values For each graph, state whether the shaded...Ch. 8 - Gun Control Historically, the percentage of U.S....Ch. 8 - Death Penalty A Pew Poll in November 2011 showed...Ch. 8 - Prob. 37SE Ch. 8 - Plane Crashes According to one source, 50 of plane...Ch. 8 - Mercury in Freshwater Fish Some experts believe...Ch. 8 - Prob. 40SE Ch. 8 - Morse’s Proportion of ts Samuel Morse determined...Ch. 8 - Morse’s Proportion of as Samuel Morse determined...Ch. 8 - p-Values (Example 11) A researcher carried out a...Ch. 8 - Coin Flips A test is conducted in which a coin is...Ch. 8 - Errors with Pennies (Example 12) Suppose you are...Ch. 8 - Errors with Toast Suppose you are testing someone...Ch. 8 - Blackstone on Errors in Trials Sir William...Ch. 8 - Alpha By establishing a small value for the...Ch. 8 - Flaws (Example 13) A person spinning a 1962 penny...Ch. 8 - Flaws The null hypothesis on true/false tests is...Ch. 8 - Which Method? A proponent of a new proposition on...Ch. 8 - Which Method? A proponent of a new proposition on...Ch. 8 - Effectiveness of Financial Incentives A...Ch. 8 - Is it acceptable practice to look at your research...Ch. 8 - If we reject the null hypothesis, can we claim to...Ch. 8 - If we do not reject the null hypothesis, is it...Ch. 8 - When a person stands trial for murder, the jury is...Ch. 8 - When, in a criminal court, a defendant is found...Ch. 8 - Arthritis A magazine advertisement claims that...Ch. 8 - No-Carb Diet A weight-loss diet claims that it...Ch. 8 - When comparing two sample proportions with a...Ch. 8 - When comparing two sample proportions with a...Ch. 8 - Prob. 63SE Ch. 8 - Prob. 64SE Ch. 8 - Prob. 65SE Ch. 8 - Prob. 66SE Ch. 8 - Prob. 67SE Ch. 8 - Prob. 68SE Ch. 8 - Smiling and Gender (Example 15) In a 1997 study,...Ch. 8 - Prob. 70SE Ch. 8 - Prob. 71CRE Ch. 8 - Prob. 72CRE Ch. 8 - Choosing a Test and Giving the Hypotheses Give the...Ch. 8 - Choosing a Test and Naming the Population(s) In...Ch. 8 - Prob. 75CRE Ch. 8 - Butter Taste Test A man is tested to determine...Ch. 8 - Biased Coin? A study is done to see whether a coin...Ch. 8 - Biased Coin? A study is done to see whether a coin...Ch. 8 - Prob. 79CRE Ch. 8 - Coin Flips Suppose you tested 50 coins by flipping...Ch. 8 - Prob. 81CRE Ch. 8 - Prob. 82CRE Ch. 8 - Prob. 83CRE Ch. 8 - Weight Loss in Men Many polls have asked people...Ch. 8 - Prob. 85CRE Ch. 8 - Prob. 86CRE Ch. 8 - Prob. 87CRE Ch. 8 - Prob. 88CRE Ch. 8 - Wording of Polls A poll in California (done by the...Ch. 8 - Prob. 90CRE Ch. 8 - Three-Strikes Law California’s controversial...Ch. 8 - Prob. 92CRE Ch. 8 - Prob. 93CRE Ch. 8 - Prob. 94CRE Ch. 8 - A friend claims he can predict the suit of a card...Ch. 8 - A friend claims he can predict how a six-sided die...Ch. 8 - Votes for Independents Judging on the basis of...Ch. 8 - Votes for Independents Refer to Exercise 8.97....Ch. 8 - Texting While Driving The mother of a teenager has...Ch. 8 - True/False Test A teacher giving a true/false test...Ch. 8 - ESP Suppose a friend says he can predict whether a...Ch. 8 - ESP Again Suppose a friend says he can predict...Ch. 8 - Does Hand Washing Save Lives? In the mid-1800s,...Ch. 8 - Prob. 104CRE Ch. 8 - Guessing on a True/False Test A true/false test...Ch. 8 - Guessing on a Multiple-Choice Test A...

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Solution Summary: The author explains how the proponent determines whether to use hypothesis testing or a confidence interval in the given case.

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Chapter 8 Solutions

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