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69 Question 20, 7.1 .21-T magnum." 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? [)5 (Type an integer or a decimal, Do not round) b. Using Emily's sample resuls' what IS the best point estimate of the therapists' success rate? (Round to three decimal places as needed) 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. = 1068 (Round up to the nearest integer.) b. Assume prior studies have shown that about 45% of full-time students earn bachelor's degrees in four years or less. h= (Round up to the nearest integer.)Question 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