A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 28 subjects had a mean wake time of 93.6 min and a standard deviation of 40.7 min. Assume that the 28 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?
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, 11 subjects had a mean wake time of 92.1 min and a standard deviation of 43.9 min. Assume that the 11 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 94.6 min and a standard deviation of 41.5 min. Assume that the 22 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, 23 subjects had a mean wake time of 102.0 min. After treatment, the 23 subjects had a mean wake time of 95.8 min and a standard deviation of 24.2 min. 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...
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 103.0 min. After treatment, the 15 subjects had a mean wake time of 97.5 min and a standard deviation of 21.9 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, 24 subjects had a mean wake time of 104.0 min. After treatment, the 24 subjects had a mean wake time of 80.3 min and a standard deviation of 23.6 min. Assume that the 24 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 used for treating insomnia in older subjects. After treatment with the drug, 15 subjects had a mean wake time of 93.2 min and a standard deviation of 40.6 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 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, 22 subjects had a mean wake time of 102.0 min. After treatment, the 22 subjects had a mean wake time of 96.4 min and a standard deviation of 21.5 min. Assume that the 22 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 104.0 min. After treatment, the 14 subjects had a mean wake time of 83.9 min and a standard deviation of 22.7 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, 1515 subjects had a mean wake time of 103.0103.0 min. After treatment, the 1515 subjects had a mean wake time of 97.497.4 min and a standard deviation of 20.520.5 min. Assume that the 1515 sample values appear to be from a normally distributed population and construct a 9595% 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 92.1 min and a standard deviation of 20.3 min. Assume that the 16 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...