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 < µ< hg (Round to one decimal place as needed.)

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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 <µ<
hg (Round to one decimal place as needed.)
Transcribed Image 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 <µ< hg (Round to one decimal place as needed.)
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 < µ<
min
(Round to one decimal place as needed.)
Transcribed Image 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 < µ< min (Round to one decimal place as needed.)
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