Introduction To Statistics And Data Analysis
6th Edition
ISBN: 9781337793612
Author: PECK, Roxy.
Publisher: Cengage Learning,
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Chapter 8.3, Problem 25E
The article “Younger Adults More Likely than Their Elders to Prefer Reading the News” (October 6, 2016, pewresearch.org/fact-tank/2016/10/06/younger-adults-more-likely-than-their-elders-to-prefer-reading-news/, retrieved March 28, 2018) estimated that only 3% of those age 65 and older who prefer to watch the news, rather than to read or listen to news, watch the news online. This estimate was based on a large sample of adult Americans conducted by the Pew Research Center. Consider the population consisting of all adult Americans age 65 and older who prefer to watch the news and suppose that for this population the actual proportion who prefer to watch online is 0.03. (Hint: See Example 8.9.)
- a. A random sample of n = 100 people will be selected from this population and
mean and standard deviation of the sampling distribution of - b. Is it reasonable to assume that the sampling distribution of
- c. Suppose that the
sample size is n = 400 rather than n = 100, as in Part (b). Does the change in sample size change the mean and standard deviation of the sampling distribution of - d. Is it reasonable to assume that the sampling distribution of
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Chapter 8 Solutions
Introduction To Statistics And Data Analysis
Ch. 8.1 - Explain the difference between a population...Ch. 8.1 - What is the difference between x and ? Between s...Ch. 8.1 - For each of the following statements, identify the...Ch. 8.1 - Consider a population consisting of the following...Ch. 8.1 - Select 10 additional random samples of size 5 from...Ch. 8.1 - Consider the following population: {1, 2, 3, 4}....Ch. 8.1 - Consider the following population: {2, 3, 3, 4,...Ch. 8.2 - A random sample is selected from a population with...Ch. 8.2 - For which of the sample sizes given in the...Ch. 8.2 - Explain the difference between and x and between ...
Ch. 8.2 - Suppose that a random sample of size 64 is to be...Ch. 8.2 - The time that a randomly selected individual waits...Ch. 8.2 - Let x denote the time (in minutes) that it takes a...Ch. 8.2 - In the library on a university campus, there is a...Ch. 8.2 - Suppose that the mean value of interpupillary...Ch. 8.2 - Suppose that a sample of size 100 is to be drawn...Ch. 8.2 - A manufacturing process is designed to produce...Ch. 8.2 - College students with checking accounts typically...Ch. 8.2 - An airplane with room for 100 passengers has a...Ch. 8.2 - The thickness (in millimeters) of the coating...Ch. 8.3 - A random sample is to be selected from a...Ch. 8.3 - a. For which of the sample sizes given in the...Ch. 8.3 - The article Younger Adults More Likely than Their...Ch. 8.3 - The article referenced in the previous exercise...Ch. 8.3 - A certain chromosome defect occurs in only 1 in...Ch. 8.3 - The U.S. Census Bureau reported that in 2015, the...Ch. 8.3 - The article Fewer Americans Are Reading, But Dont...Ch. 8.3 - Suppose that a candidate for public office is...Ch. 8.3 - A manufacturer of computer printers purchases...Ch. 8 - The nicotine content in a single cigarette of a...Ch. 8 - Let x1, x2, , x100 denote the actual weights (in...Ch. 8 - Suppose that 20% of the subscribers of a cable...Ch. 8 - Water permeability of concrete can be measured by...Ch. 8 - Suppose that 40% of all U.S. employees contribute...Ch. 8 - The amount of money spent by a customer at a...
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- What term is used to express the likelihood of an event occurring? Are there restrictions on its values? If so, what are they? If not, explain.arrow_forwardThe Pew Research Center has reported results of many studies highlighting political topics and potential public policy. For example, when Gallup first surveyed public opinion about the legalization of marijuana in 1969, only 12% of the public favored legalization. A more recent survey from March 2016 showed 53% of the public favoring legalization of marijuana. To examine potential generational differences in the proportions who favor the legalization of marijuana, researchers randomly surveyed groups of Baby Boomers (those born between 1946 and 1964) and Millennials (those born from 1981 to 1997) asking the following question: "Do you support the legalization of marijuana for medical and recreational use in the United States?" The data were as follows. Yes No Total Baby Boomers (population 1) 312 293 605 Millennials (population 2) 349 286 635 (a) State the appropriate null and alternative hypotheses. H0: p1 ? < = > ≠ p2 Ha: p1 ? < = > ≠ p2 (b) Find…arrow_forwardA Harris Interactive poll reported that 32.4% of 275 randomly selected Americans living in the west stated that they attend church regularly. Whereas, 57.6% of 264 randomly selected Americans living in the south stated that they attend church regularly. Based on the results of this poll, can one reach the conclusion that the proportion of Americans who attend church regularly is lower in the west than in the south? Use ! = 5%.arrow_forward
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