A clinical trial was conducted to test the effectiveness of a drug to treat insomnia in 20 older subjects. After treatment, the 20 subjects had a standard deviation ( s ) wake time of 44.8min. Assume that the 20 sample values appear to be from a normally distributed population and construct a 95% confidence interval estimate of the standard deviation of the wake times. Round values to two decimal places.
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A clinical trial was conducted to test the effectiveness
of a drug to treat insomnia in 20 older subjects. After
treatment, the 20 subiects had a standard deviation (
s) wake time of 44.8 min. Assume that the 20 sample
values appear to be from a normally distributed population and construct a 95% confidence interval
estimate of the standard deviation of the wake times.
Round values to two decimal places.