sample mean 'x̄= | 77.100 | |
sample size n= | 24 | |
std deviation s= | 23.9000 | |
std error ='sx=s/√n=23.9/√24= | 4.8786 |
for 90% CI; and 23 df, value of t= | 1.714 | from excel: t.inv(0.95,23) | ||
margin of error E=t*std error = | 8.361 | |||
lower bound=sample mean-E = | 68.739 | |||
Upper bound=sample mean+E = | 85.461 | |||
from above 90% confidence interval for population mean =(68.7 , 85.5) |
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, 24 subjects had a mean wake time of 1010 min. After treatment, the 24 subjects had a mean wake time of 77.1 min and a standard deviation of 23.9 min. Assume that the 24 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...
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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, 24 subjects had a mean wake time of 103.0 min. After treatment, the 24 subjects had a mean wake time of 79.2 min and a standard deviation of 20.2 min. Assume that the 24 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...
Aclinical 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 min. Ater treatment, the 16 subjects had a mean wake time of 79,5 min and a standard deviation of 202 min. Asume that the 16 sample values appear to be from anomaly diwibuted population and construct a confidence intervalimate of the mean wake time for a population with drug treatments. What does...
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 100.0 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...
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...