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 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 drug treatments. What does the result suggest about the mean wake time of 105.0 min before the treatment? Does the drug appear to be effective?

Answer #1

(a)

(b) As the both limits are less than 105, the result suggest that the mean wake time is less than 105.0 min after the treatment.

(c) The drug appears to be effective since the result suggest that the mean wake time is less than 105.0 min after the treatment.

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...

A clinical trial was conducted to test the effectiveness of a
drug for treating insomnia in older subjects. Before treatment, 15
subjects had a mean wake time of 105.0 min. After treatment, the
15 subjects had a mean wake time of 101.6 min and a standard
deviation of 21.5 min. Assume that the 15 sample values appear to
be from a normally distributed population and construct a 90%
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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, 17
subjects had a mean wake time of 105.0 min. After treatment, the
17 subjects had a mean wake time of 95.6 min and a standard
deviation of 23.9 min. Assume that the 17 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,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....

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 105.0 min. After treatment, the
25 subjects had a mean wake time of 78.1 min and a standard
deviation of 21.4 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,
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...

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