A sample of size n = 92 is drawn from a normal population whose standard deviation is ? = 7.9. The sample mean is x? = 35.41. Part 1 of 2 (a) Construct a 99.8% confidence interval for ?. Round the answer to at least two decimal places. A 99.8% confidence interval for the mean is < ? < . Part 2 of 2 (b) If the population were not approximately normal, would the confidence interval constructed in part (a) be valid? Explain. The confidence interval constructed in part (a) would be valid since the sample size (Choose one) large.
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8% confidence interval. We can look this up in a standard normal distribution table or use a calculator. The critical value for a 99.8% confidence interval is approximately 2.576. Show more…
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