Question

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 the result suggest about the mean wake time of 101,0 min before the treatment does the appear to be effective? Construct the 95% confidence interval estimate of the mean wake time for a population with the treatment (Round to one decimal place as needed) What does the result sgpost about the mean wake time of 101.0 min before the treatment? Does the drug appear to be effective? The confidence interval the mean wake ime of 1010 min before the treatment, so the means before and after the treatment significant effect This result suggests that the drug treatment

Answer 1

n=16, X = 79.5, 5=202,c=950) Critical value, = 1-0.45-0.05 9/2 = 0.025 tal2, 4 to 025,15 = +2:31 (using t table] 95% confidence interval at a tal2, df a - 79.5+ 8.131 x 2012 16 = 79.5+ 10.76155 68.73845, 90.26155 [68.7 < M <1903 95.7.7 The Confidence interval does not include the mean wake time of lobomin, before the beatment So the means before and after the treatment and different this seselt suggests that the doug Beatment has a significant offeet.