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Here are summary statistics for randomly selected weights of newborn? girls: n=181?, x =31.9 ?hg, se=.7 hg. Construct a confidence interval estimate of the mean. Use a 95?% confidence level. Are these results very different from the confidence interval 30.7<u<32.9 hg with only 20 sample? values, x=31.8 ?hg, and s=2.4 ?hg?

95% Confidence interval of the mean(using z or normal distribution)