A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After t

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 95.6 min and a standard deviation of 42.1 min. Assume that the 12 sample values appear to be from a normally distributed population and construct a 90% confidence interval estimate to the standard deviation of the wake times for a population with the drug treatments. Does the result indicate whether the treatment is effective?

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Confsd001.pdf

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*** clinical trial *** conducted *** test the *** *** *** *** *** for *** *** *** *** subjects. After treatment with the *** *** subjects *** a mean *** time *** 95.6 min and *** *** *** 42.1 *** Assume *** the 12 *** *** *** *** be from *** normally distributed *** and construct *** 90% condence *** *** to the *** deviation *** *** wake times *** *** population with the *** treatments. Does the *** *** *** the *** is *** that the *** *** *** 12, *** *** deviation iss= *** We *** *** *** *** interval *** *** standard deviation . Step *** Specify the condence level (1) Condence level is 1 = *** *** . *** *** level of *** *** = 0 :1 *** 2 Given *** *** sample size n= 12 and sample *** deviation s= 42 *** *** 3 Specify *** formula 100(1 *** condence *** estimate *** *** *** *** is *** ( n *** 1)s2 2 ( *** 2;n *** *** *** *** 1)s2 2 (1 = *** *** *** *** *** 1)and 2 (1 *** 2;n *** *** critical values *** 2distribution *** of *** 1degrees of freedom. Step *** *** the critical *** *** *** *** 2forlevel *** signicance *** *** freedom *** = 2;n *** 2 (0 *** *** *** and *** *** 2;n *** *** *** *** *** 4 :575 *** *** Determine the *** interval 90 *** condence interval estimate *** population *** *** is s *** *** *** *** 2;n *** *** ( n *** *** = 2;n *** *** :41 19 :675 r 11 1772 :41 4 :575 31 :479 *** : Thus *** *** *** *** *** standard *** *** (31:479 *** :28) . The *** indicate *** the treatment is eective. 2Critical values *** dist. 04.57519.67523.68 0.050.90.05