Question

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 drug treatments. What does the result suggest about the mean wake time of

102.0 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, 14
subjects had a mean wake time of 102.0 min. After treatment, the
14 subjects had a mean wake time of 97.6 min and a standard
deviation of 23.7 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, 18
subjects had a mean wake time of 102.0 min. After treatment, the
18 subjects had a mean wake time of 74.7 min and a standard
deviation of 22.7 min. Assume that the 18 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 weight time of 100.0 min. after treatment, the
14 subjects had a mean wake time of 96.2 min and a standard
deviation of 22.6 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, 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, 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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