(a) An article in a medical journal suggested that approximately 18% of such operations result in complications. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.06? A sample of 111 operations is needed to obtain a 90% confidence interval with a margin of error of 0.06 using the estimate 0.18 for p. Part: 1/ 2 Part 2 of 2 (b) Estimate the sample size needed if no estimate of p is available. A sample of operations is needed to obtain a 90% confidence interval with a margin of error of 0.06 when no estimate of p is available.

1 Suppose that the average time spent per day with digital media several years ago was 3 hours and 22 minutes. For last​ year, a random sample of 20 adults in a certain region spent the numbers of hours per day with digital media given in the accompanying table. Preliminary data analyses indicate that the​ t-interval procedure can reasonably be applied. Find and interpret a 90​% confidence interval for last​ year's mean time spent per day with digital media by adults of the region.​ (Note: x=5.88hr and s=2.27​hr.)   The 90​% confidence interval is from ( ? ) ​hour(s) to ( ? )​hour(s).  Interpret the 90​% confidence interval. Select all that apply.     A. There is a 90​% chance that the mean amount of time spent per day on digital media last year by all adults in the region is between the​ interval's bounds.   B.With 90​% ​confidence, the mean amount of time spent per day on digital media last year by all adults in the region is between the​ interval's bounds.   C.90​% of all…