Question

A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 22 subjects had a mean wake time of 93.8 min and a standard deviation of 44.1 min. Assume that the 22 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 for a population with the drug treatments. Does the result indicate whether the treatment is effective?

Answer #1

A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug, 15 subjects had a mean wake time of 90.6 min and a
standard deviation of 43.4 min. Assume that the 15 sample values
appear to be from a normally distributed population and construct a
90% confidence interval estimate of the standard deviation of the
wake times for a population with the drug treatments. Does the
result...

A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug, 27 subjects had a mean wake time of 96.7 min and a
standard deviation of 41.8 min. Assume that the 27 sample values
appear to be from a normally distributed population and construct a
90% confidence interval estimate of the standard deviation of the
wake times for a population with the drug treatments. Does the
result...

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 105.0 min. After treatment, the
21 subjects had a mean wake time of 84.6 min and a standard
deviation of 22.6 min. Assume that the 21 sample values appear to
be from a normally distributed population and construct a 95%
confidence interval estimate of the mean wake time for a population
with...

A clinical trial was conducted to test the effectiveness of a
drug for treating insomnia in older subjects. Before
treatment,
25
subjects had a mean wake time of
103.0
min. After treatment, the
25
subjects had a mean wake time of
75.9
min and a standard deviation of
24.8
min. Assume that the
25
sample values appear to be from a normally distributed
population and construct a
99%
confidence interval estimate of the mean wake time for a
population with...

A clinical trial was conducted to test the effectiveness of a
drug for treating insomnia in older subjects. Before treatment,
14
subjects had a mean wake time of 102.0 min. After treatment,
the 14 subjects had a mean wake time of
97.4 min and a standard deviation of 23.2 min. Assume that the
14 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...

A clinical trial was conducted to test the effectiveness of a
drug for treating insomnia in older subjects. Before treatment, 19
subjects had a mean wake time of 103.0 min. After treatment, the
19 subjects had a mean wake time of 94.8 min and a standard
deviation of 24.9 min. Assume that the 19 sample values appear to
be from a normally distributed population and construct a 99%
confidence interval estimate of the mean wake time for a population
with...

A
clinical trial was conducted to test the effectiveness of a drug
for treating insomnia in older subjects. Before treatment, 25
subjects had a mean wake time of 103.0 min. After treatment, the 25
subjects had a mean wake time of 96.1 min and a standard deviation
of 22.8 min. Assume thay the 25 sample values appear to be from a
normally distrubuted population and construct a 95% confidence
interval estimate of the mean wake time for a population with...

A clinical trial was conducted to test the effectiveness of a
drug for treating insomnia in older subjects. Before treatment, 23
subjects had a mean wake time of 100.0 min. After treatment, the
23 subjects had a mean wake time of 90.1 min and a standard
deviation of 24.4 min. Assume that the 23 sample values appear to
be from a normally distributed population and construct a 99%
confidence interval estimate of the mean wake time for a population
with...

A clinical trial was conducted to test the effectiveness of a
drug for treating insomnia in older subjects. Before treatment, 13
subjects had a mean wake time of 101.0 min. After treatment, the
13 subjects had a mean wake time of 94.8 min and a standard
deviation of 23.62 min. Assume that the 13 sample values appear to
be from a normally distributed population and construct a 95%
confidence interval estimate of the mean wake time for a population
with...

A clinical trial was conducted to test the effectiveness of a
drug for treating insomnia in older subjects. Before treatment, 13
subjects had a mean wake time of 105.0 min. After treatment, the
13 subjects had a mean wake time of 77.6 min and a standard
deviation of 23.2min. Assume that the 13 sample values appear to be
from a normally distributed population and construct a 99%
confidence interval estimate of the mean wake time for a population
with drug...

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