Basic Business Statistics, Student Value Edition (13th Edition)
Basic Business Statistics, Student Value Edition (13th Edition)
13th Edition
ISBN: 9780321946393
Author: Mark L. Berenson, David M. Levine, Kathryn A. Szabat
Publisher: PEARSON
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Chapter 7, Problem 18PS

A Pew Research Center project on the state of news media showed that the clearest pattern of news audience growth in 2012 came on digital platforms. According to Pew Research data. 39 % of Americans get news online or from a mobile device in a typical day. (Data extracted from “Key Findings: State of the News Media," Pew Research Center, bit.ly/10kKUTi.)

a. Suppose that you take a sample of 100 Americans. It the population proportion of Americans who get news online or from a mobile device in a typical day is 0.39, what is the probability that fewer than 30 % in your sample will get news online or from a mobile device in a typical day?

b. Suppose that you take a sample of 400 Americans. If' the population proportion of Americans who get news online or from a mobile device in a typical day is 0.39, what is the probability that fewer than 30 % in your sample will get news online or from a mobile device in a typical day?

c. Discuss the effect of sample size on the sampling distribution of the proportion in general and the effect on the probabilities in (a) and (b).

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Chapter 7 Solutions

Basic Business Statistics, Student Value Edition (13th Edition)

Ch. 7 - Given a normal distribution with =100and=10, if...Ch. 7 - Given a normal distribution with =50and=5, if you...Ch. 7 - For each of the following three populations,...Ch. 7 - The following data represent the number of days...Ch. 7 - The diameter of a brand of tennis balls is...Ch. 7 - Prob. 6PSCh. 7 - According to a mashable post. time spent on...Ch. 7 - Today, full-time college students report spending...Ch. 7 - In a random sample of 64 people, 48 are classified...Ch. 7 - A random sample of 50 households was selected for...
Ch. 7 - The following data represent the responses (Y for...Ch. 7 - A political pollster is conducting an analysis of...Ch. 7 - You plan to conduct a marketing experiment in...Ch. 7 - Prob. 14PSCh. 7 - Prob. 15PSCh. 7 - Prob. 16PSCh. 7 - The Chartered Financial Analyst (CFA) institute...Ch. 7 - A Pew Research Center project on the state of news...Ch. 7 - Why is the sample mean an unbiased estimator of...Ch. 7 - Why does the standard error of the mean decrease...Ch. 7 - Why does the sampling distribution of the mean...Ch. 7 - What is the difference between a population...Ch. 7 - Under what circumstances does the sampling...Ch. 7 - An industrial sewing machine uses ball bearings...Ch. 7 - The fill amount of bottles of a soft drinks is...Ch. 7 - Prob. 26PSCh. 7 - In Problem 7.26, suppose that the mean amount of...Ch. 7 - Prob. 28PSCh. 7 - Prob. 29PS
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