If the sample has a standard deviation of 12.23 points, find a 90% confidence interval for the population standard deviation. Solution: We first need to find the critical values: and. Then the confidence interval is: So we are 90% confident that the standard deviation of the IQ of ECC students is between 10.10 and 15.65 bpm.
Learning Objectives. To become familiar with the concept of an interval estimate of the population mean. To understand how to apply formulas for a confidence interval for a population mean.
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how to find 98 confidence interval
