Here are summary statistics for randomly selected weights of newborn​ girls: n=186​, x=32.9 hg, s=7.2 hg   Construct a confidence interval estimate of the mean. Use a 90​% confidence level. Are these results very different from the confidence interval 31.1 hg<μ<34.1 hg with only 12 sample​ values, x=32.6 hg, and s=2.9 hg?

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A: Givensample size(n)=100p^=0.9α=1-0.95=0.05α2=0.025zc=zα2=z0.025=1.96   (from z table)

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A: n = 21  s​ = 12.6 confidence interval = 80%.

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Q: Using the results below:          M1 = 18.57,    M2 = 18.33,    SM1−M2 = 0.97,    tcv = 1.997 1.…

A: Given, M1 = 18.57,    M2 = 18.33,    SM1−M2 = 0.97,    tcv = 1.997

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Q: We have presented a confidence interval (CI) for the difference, μ1 − μ2, between two population…

A: It is given that the 95% confidence interval for the difference between two population  means is…