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 105.0 min. After treatment, the 25 subjects had a mean wake time of 81.6 min and a standard deviation of 23.9 min. Assume that the 25 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?

a) Construct the 95% confidence interval estimate of the mean wake time for a population with the treatment.

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

The confidence interval (does not include/includes) the mean wake time of 105.0 min before the treatment, so the mean before and after the treatment (could be the same/are different). This result suggests that the drug treatment (does not have/ has) a significant effect.

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 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, 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 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, 16
subjects had a mean wake time of 101.0 min. After treatment, the
16 subjects had a mean wake time of 79.7 min and a standard
deviation of 23.9 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, 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%
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...

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, 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, 15
subjects had a mean wake time of 102.0 min. After treatment, the
15 subjects had a mean wake time of 96.3 min and a standard
deviation of 23.5 min. Assume that the 15 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,
23 subjects had a mean wake time of 101.0min. After treatment,
the 23 subjects had a mean wake time of 76.6
min and a standard deviation of 22.9min. Assume that the 23
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....

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