Here are summary statistics for randomly selected weights of newborn girls: n=159, x-30.7 hg.s-6.4 hg. Construct a confidence interval estimate of the mean. Use a 98% confidence level. Are these results very different from the confidence interval 29.2 hg < <32.4 hg with only 12 sample values, x-30.8 hg. and s-2.1 hg? What is the confidence interval for the population mean? hg <