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Chapter 8: Q.44 (page 479)
Define the random variable X in words.
The random variable indicates the amount of time Americans spend watching television every month.
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The population standard deviation for the height of high school basketball players is three inches. If we want to be % confident that the sample mean height is within one inch of the true population mean height, how many randomly selected students must be surveyed?
The American Community Survey (ACS), part of the United States Census Bureau, conducts a yearly census similar to the one taken every ten years, but with a smaller percentage of participants. The most recent survey estimates with confidence that the mean household income in the U.S. falls between . Find the point estimate for mean U.S. household income and the error bound for mean U.S. household income.
Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of pizza delivery restaurants is taken and has a sample mean delivery time of minutes.
Find a % confidence interval estimate for the population mean delivery time.
In complete sentences, explain why the confidence interval in Exercise 8.17 is larger than in Exercise 8.18.
Define the random variables and in words.
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