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1)Here are summary statistics for randomly selected weights of newborngirls: =151, x=31.7hg, s=6. Construct a confidence interval estimate of the...
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Question

1)Here are summary statistics for randomly selected weights of newborn​ girls:

=151, x=31.7​hg, s=6.3 hg. Construct a confidence interval estimate of the mean. Use a 95% confidence level. Are these results very different from the confidence interval 30.4 hg< μ< 32.4 hg with only 19 sample​ values, x=31.4 ​hg, and s=2.1 ​hg?


What is the confidence interval for the population mean μ​?


2)A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before​ treatment, 21 subjects had a mean wake time of 100.0 min. After​ treatment, the 21 subjects had a mean wake time of 75.3 min and a standard deviation of 21.7 min. Assume that the 21 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 100.0 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.

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