A simple random sample of size n=14 is drawn from a population that is normally distributed. The sample mean is found to be x=69 and the sample standard deviation is found to be s=20. Construct a 90% confidence interval about the population mean. (Round to two decimal places as needed.) The lower bound is ? The upper bound is ?
Added by Leonard J.
Step 1
Given that the critical value for a 90% confidence interval is 1.77, and the sample standard deviation is 20, we can calculate the margin of error using the formula: Margin of Error = Critical Value * (s / sqrt(n)) Margin of Error = 1.77 * (20 / sqrt(14)) Margin Show more…
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