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MA275-04 Biostatistics Yasmin Baytaroglu & | 10/14/20 12:35 PM Homework: Sec. 7.2 Save Score: 0 of 1 pt 4 of 9 (2 complete) HW Score: 18.52%, 1.67 of 9 pts 7.2.8-T Question Help Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value to /2, (b) find the critical value Zo /2, or (c) state that neither the normal distribution nor the t distribution applies. Here are summary statistics for randomly selected weights of newborn girls: n = 200, x = 33.9 hg, s = 7.9 hg. The confidence level is 99%. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. to/2= Round to two decimal places as needed.) OB. Zu/2= (Round to two decimal places as needed.) O C. Neither the normal distribution nor the t distribution applies. Click to select and enter your answer(s) and then click Check Answer. ? All parts showing Clear All Check AnswerMA275-04 Biostatistics Yasmin Baytaroglu & | 10/14/20 12:35 PM Homework: Sec. 7.2 Save Score: 0 of 1 pt 5 of 9 (2 complete) HW Score: 18.52%, 1.67 of 9 pts 7.2.13-T Question Help 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 105.0 min. After treatment, the 16 subjects had a mean wake time of 82.6 min and a standard deviation of 20.9 min. Assume that the 16 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 drug treatments. What does the result suggest about the mean wake time of 105.0 min before the treatment? Does the drug appear to be effective? Construct the 90% confidence interval estimate of the mean wake time for a population with the treatment. min