A random sample of 20 was taken from a normally distributed population with a mean of 18. The sample mean was found to be 70. An 80% confidence interval for the population mean was constructed based on the sample.
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A simple random sample of n=20 is drawn from a population that is nor.pdf
1. A simple random sample of n=20 is drawn from a population that is normally distributed with
=18. The sample mean is found to be x=70. Construct a 80% confidence interval for the
population mean. Confidence interval: