A certain region would like to estimate the proportion of voters who intend to participate in upcoming elections. A pilot sample of 50 voters found that 34 of them intended to vote in the election Determine the additional number of voters that need to be sampled to construct a 94% interval with a margin of error equal to 0 04 to estimate the proportion. The region should sample u additional voters (Round up to the nearest integer.) X Try again. 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, Za/2, the sample proportion, p, and the margin of error of the proportion, ME (2a12) 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 voters already sampled from the sample size to determine the additional number of voters that need to be sampled. OK