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 drug treatments. What does the result suggest about the mean wake time of 102.0 min before the treatment? Does the drug appear to be effective?
Solution:- Given data X = 95.8, s = 24.2, n = 23 95% confidence
level
df = n-1 = 22, t = 2.074
95% confidence interval estimate of the mean wake time for a
population with drug treatments = X +/- t*s/sqrt(n)
= 95.8 +/- 2.074*24.2/sqrt(23)
= 85.3345 , 106.2655
= 85.3 , 106.3 (rounded)
=> A mean wake time of 102.0 min is likel,because it lies in the confidence interval and the thus zopiclone does not seem effective
A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in...
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...
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 101.0 min. After treatment, the 25 subjects had a mean wake time of 75.9 min and a standard deviation of 20.7 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, 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 20 subjects had a mean wake time of 100.0 min. after treatment the 20 subjects had a mean wake time of 96.6 min. ans a standard deviation of 22.6 min. assume that the 20 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, 22 subjects had a mean wake time of 103.0 min. After treatment, the 22 subjects had a mean wake time of 98.3 min and a standard deviation of 23.1 min. Assume that the 22 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, 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 for treating insomnia in older subjects. Before treatment, 21 subjects had a mean wake time of 1000 min After treatment, the 21 subjects had a mean wake time of 77.2 min and a standard deviation of 23.4 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...