Question

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 104.0min. After treatment, the 21 subjects had a mean wake time of 80.2 min and a standard deviation of 24.7 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 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?

Answer #1

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 104.0 min. After treatment, the
13 subjects had a mean wake time of 99.5 min and a standard
deviation of 24.9 min. Assume that the 13 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, 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,
21 subjects had a mean wake time of
101.0 min. After treatment, the 21 subjects had a mean wake
time of 97.4 min and a standard deviation of
23.9 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...

A clinical trial was conducted to test the effectiveness of a
drug for treating insomnia in older subjects. Before treatment, 16
subjects had a mean wake time of 104.0 min. After treatment, the
16 subjects had a mean wake time of 98.2 min and a standard
deviation of 22.8 min. Assume that the 16 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,19
subjects had a mean wake time of
104.0 min. After treatment, the 19
subjects had a mean wake time of 94.8 min and a standard
deviation of 24.5 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 drug...

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...

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