Here are summary statistics for randomly selected weights of newborn girls: n=167 xbar= 27.3hg, s=6.3hg. Construct a confidence interval estimate of the mean. Use a 90% confidence level. Are these results very different from the confidence interval 26.6hg < u <26.4hg with only 20 sample values, xbar=27.5hg, and s=2.2 hg?
What is the confidence interval for the population mean ?
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