Here are summary statistics for randomly selected weights of newborn girls: n = 167, x = 31.7 hg, s = 6.6 hg. Construct a confidence interval estimate of the mean. Use a 98% confidence level. Are...

Extracted text: Here are summary statistics for randomly selected weights of newborn girls: n = 167, x = 31.7 hg, s = 6.6 hg. Construct a confidence interval estimate of the mean. Use a 98% confidence level. Are these results very different from the confidence interval 29.8 hg < µ="">< 32.8="" hg="" with="" only="" 14="" sample="" values,="" x="31.3" hg,="" and="" s="2.1" hg?="" .....="" what="" is="" the="" confidence="" interval="" for="" the="" population="" mean="" µ?="" hg=""><>< hg="" (round="" to="" one="" decimal="" place="" as="">


Extracted text: A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 22 subjects had a mean wake time of 104.0 min. After treatment, the 22 subjects had a mean wake time of 100.2 min and a standard deviation of 24.7 min. Assume that the 22 sample values appear to be from a normally distributed population and construct a 90% confidence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of 104.0 min before the treatment? Does the drug appear to be effective? Construct the 90% confidence interval estimate of the mean wake time for a population with the treatment. min <>< min="" (round="" to="" one="" decimal="" place="" as="">