Suppose a hospital would like to estimate the proportion of patients who feel that physicians who care for them always communicated effectively when discussing their medical care. A pilot sample of 40 patients found that 26 reported that their physician communicated effectively Determine the additional number of patients that need to be sampled to construct a 99% confidence interval with a margin of error equal to 7% to estimate this proportion. The additional number of patients that need to be sampled is g (Round up to the nearest integer.) X That's incorrect. X Use technology or the following formula to find the required sample size. In this formula, the sample size, n, needed to estimate a population proportion is given in terms of the critical z-score, Zu/2, the sample proportion, p, and the margin of error of the proportion, ME (Za/2) 2p (1-P) n = ( ME ,) 2 If the sample proportion cannot be determined, use the most conservative value. Once the sample size has been determined, subtract the number of patients already sampled from the sample size to determine the additional number of patients that need to be sampled. OK