Question

A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 22 subjects had a mean wake time of 93.8 min and a standard deviation of 44.1 min. Assume that the 22 sample values appear to be from a normally distributed population and construct a 95% confidence interval estimate of the standard deviation of the wake times for a population with the drug treatments. Does the result indicate whether the treatment is effective?

Answer #1

A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug, 15 subjects had a mean wake time of 90.7 min and a
standard deviation of 44.9 min. Assume that the 15 sample values
appear to be from a normally distributed population and construct a
90% confidence interval estimate of the standard deviation of the
wake times for a population with the drug treatments. Does the
result...

A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug, 24 subjects had a mean wake time of 90.8 min and a
standard deviation of 43.4 min. Assume that the 24 sample values
appear to be from a normally distributed population and construct a
95 % confidence interval estimate of the standard deviation of the
wake times for a population with the drug treatments. Does the...

A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug, 14 subjects had a mean wake time of 97.6 min and a
standard deviation of 41.9 min. Assume that the 14 sample values
appear to be from a normally distributed population and construct a
98% confidence interval estimate of the standard deviation of the
wake times for a population with the drug treatments. Does the
result...

A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug, 22 subjects had a mean wake time of
97.7 min and a standard deviation of 40.4 min. Assume that the
22 sample values appear to be from a normally distributed
population and construct a 95% confidence interval estimate of the
standard deviation of the wake times for a population with the drug
treatments. Does the result...

A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug, 15 subjects had a mean wake time of 90.6 min and a
standard deviation of 43.4 min. Assume that the 15 sample values
appear to be from a normally distributed population and construct a
90% confidence interval estimate of the standard deviation of the
wake times for a population with the drug treatments. Does the
result...

A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug,1515subjects had a mean wake time of 95.195.1 min
and a standard deviation of 41.541.5 min. Assume that the 1515
sample values appear to be from a normally distributed population
and construct a 9898% confidence interval estimate of the standard
deviation of the wake times for a population with the drug
treatments. Does the result indicate whether...

A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug, 27 subjects had a mean wake time of 96.7 min and a
standard deviation of 41.8 min. Assume that the 27 sample values
appear to be from a normally distributed population and construct a
90% confidence interval estimate of the standard deviation of the
wake times for a population with the drug treatments. Does the
result...

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,
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...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 14 minutes ago

asked 19 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago