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Find the Confidence Interval for mean.

A researcher would like to find out how physical endurance is affected by a common herbal supplement. The researcher measures endurance for a sample of n = 9 participants. Each individual is then given a 30-day supply of the herbs and, 1 month later, endurance is measured again. For this sample, endurance increased by an average of M_D = 6 points with SS = 216. Make a point estimate of the population mean difference in endurance after taking the herbs. Create a 95 percent confidence interval estimate of the population mean difference.

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