A random sample of 100 students is selected from a certain school. They are given an IQ test which has a known standard deviation of 11. The sample mean is found to be 112 . Determine a \( 98 \% \) confidence interval for estimating the mean school intelligence.
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Step 1
Since we are trying to estimate a population mean, we choose the sample mean (112) as the sample statistic. Step 2: Select a confidence level. In this analysis, the confidence level is defined for us in the problem. We are working with a 98% confidence Show more…
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