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Question 20, 7.1.21-T Question Help V a In a science fair project, Emily conducted an experiment In which she tested professional touch therapists to see it they could sense her energy eld She ipped a coin to select either her right hand or her left hand, and then she asked the therapists to identify the selected hand by placing their hand Just under Emily's hand Without seeing it and without touching it Among 346 trials' the touch therapists were correct 161 times Complete parts (a) through (d), a. Given that Emily used a coin toss to select either her right hand or her left hand, what proportion of correct responses would be expected it the touch therapiss made random guesses? 182 (Type an integer or a decimal, Do not round) Question 21, 7.1.33-T Question Help In a study of government financial aid for college students, it becomes necessary to estimate the percentage of full-time college students who earn a bachelor's degree in four years or less. Find the sample size needed to estimate that percentage. Use a 0.03 margin of error and use a confidence level of 95%. Complete parts (a) through (c) below. a. Assume that nothing is known about the percentage to be estimated. n= (Round up to the nearest integer.)Question 23, 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 zx /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 = 174, x = 32.7 hg, s =6.4 hg. The confidence level is 99%. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. X One or more of your responses is incorrect. X O A. ta/2 = 2.58 (Round to two decimal places as needed.) When the standard deviation, o, is known, use the normal distribution. When it is O B. Za/2= not known, use the t distribution. To be able to use either the normal or the t distribution, either the sample must come from a normally distributed population or (Round to two decimal places as needed.) the sample size must be greater than 30. Recall, neither of these tests are used O C. Neither the normal distribution nor the t distribution applies. when the population is not normally distributed and n s 30. OKQuestion 25, 7.3. 11-T Question Help A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 22 subjects had a mean wake time of 90.8 min and a standard deviation of 43.8 min. Assume that the 22 sample values appear to be from a normally distributed population and construct a 90% confidence interval estimate of the standard deviation of the wake times for a population with the drug treatments. Does the result indicate whether the treatment is effective? Find the confidence interval estimate. 35.12 min