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Unformatted text preview: Chapter 8 Interval Estimation Population Mean: Known- To develop an interval estimate of a population mean, either the population standard deviation or the sample standard deviation s must be used to compute the margin of error Margin of Error and the Interval Estimate- The confidence level of an interval containing population mean expresses the percentage of times that all intervals formed by subtracting and adding a margin of error from the sample mean xbar will contain the population mean . The value in decimal form is the confidence coefficient , and the interval created by adding and subtracting from xbar is the confidence interval Population Mean: Unknown- If an estimate of the population standard deviation cannot be developed prior to sampling, we must use the sample standard deviation s to estimate - When s is used to estimate , the margin of error and the interval estimate for the population mean are based on a probability distribution known as the t distribution...
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- Fall '07