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Chapter 8: Q 8.1. (page 319)
The value of a statistic used to estimate a parameter is called a ______ of the parameter.
The value of a statistic used to estimate a parameter is called a point estimate of the parameter.
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Assume that the population standard deviation is known and decide weather use of the z-interval procedure to obtain a confidence interval for the population mean is reasonable. Explain your answers.
The variable under consideration is very close to being normally distributed, and the sample size is .
Corporate Farms. The U.S. Census Bureau estimates the mean value of the land and buildings per corporate farm. Those estimates are published in the Census of Agriculture, Suppose that an estimate, , is obtained and that the margin of error is . Does this result imply that the true mean. , is within of the estimate? Explain your answer.
The margin of error is also called the maximum error of the estimate. Explain why.
Suppose that you take simple random samples from a population and that, for each sample, you obtain a confidence interval for an unknown parameter. Approximately how many of those confidence intervals will not contain the value of the unknown parameter?
Fuel Expenditures. In estimating the mean monthly fuel expenditure, , per household vehicle, the Energy Information ministration takes a sample of size . Assuming that . determine the margin of error in estimating at the level of confidence.
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