Question

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

103.0

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, 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, 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, 24
subjects had a mean wake time of 103.0 min. After treatment, the 24
subjects had a mean wake time of 93.6 min and a standard deviation
of 24.1 min. Assume that the 24 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 103.0 min. After treatment, the
13 subjects had a mean wake time of 80.4 min and a standard
deviation of 22.3 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,
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, 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, 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,
1616
subjects had a mean wake time of
102.0102.0
min. After treatment, the
1616
subjects had a mean wake time of
97.597.5
min and a standard deviation of
20.320.3
min. Assume that the
1616
sample values appear to be from a normally distributed
population and construct a
9090%
confidence interval estimate of the mean wake time for a
population with...

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