Question 6 of 11 (2 points) | Question Attempt Surgical complications: A medical researcher wants to construct a 99% confidence interval for the proportion of knee replacement surgeries that result in complications. Part: 0 / 2 Part 1 of 2 (a) An article in a medical journal suggested that approximately 13% 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 0.07? A sample of 153 operations is needed to obtain a 99% confidence interval with a margin of error of 0.07 using the X estimate 0.13 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 99% confidence interval with a margin of error of 0.07 when no estimate X s available