A camp director is interested in the mean number of letters each child sends during his orher camp session. The population standard deviation is known to be 2.5. A survey of 20campers is taken. The mean from the sample is 7.9 with a sample standard deviation of 2.8.Construct a 90% confidence interval for the population mean number of letters camperssend home. What will happen to the error bound and confidence interval if 500 campers aresurveyed?
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