Question
In: Statistics and Probability
A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia...
A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug,
1919
subjects had a mean wake time of
98.798.7
min and a standard deviation of
44.744.7
min. Assume that the
1919
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 the treatment is effective?
Find the confidence interval estimate
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orchestra answered 2 years agoRelated Solutions
A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia...
A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug,
26
subjects had a mean wake time of
95.6
min and a standard deviation of
42.6
min. Assume that the
26
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...
A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug, 16 subjects had a mean wake time of 95.8 min and a
standard deviation of 43.2 min. Assume that the 16 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...
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 94.9 min and a
standard deviation of 41.5 min. Assume that the 15 sample values
appear to be from a normally distributed population and construct a
98% confidence interval estimate of the standard deviation of the
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A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia...
A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug, 26 subjects had a mean wake time of 96.1 min and a
standard deviation of 41.2 min. Assume that the 26 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...
A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug, 12 subjects had a mean wake time of 92.3 min and a
standard deviation of 41.6 min. Assume that the 12 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...
A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug,13 subjects had a mean wake time of 90.4 min and a
standard deviation of 44.8 min. Assume that the 13 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 indicate...
A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia...
A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug,13 subjects had a mean wake time of 90.4 min and a
standard deviation of 44.8 min. Assume that the 13 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 indicate...
A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia...
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 92.9 min and a
standard deviation of 42.9 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...
A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug, 29 subjects had a mean wake time of 90.4 min and a
standard deviation of 42.5 min. Assume that the 29 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...
A clinical trial was conducted to test the effectiveness of a
drug used for treating insomnia in older subjects. After treatment
with the drug, 30 subjects had a mean wake time of 93.8min and a
standard deviation of 43.3 min. Assume that the 30 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 indicate...
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