QuestionA 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 42 of them intended to vote in the election. Determine the additional number of voters that need to be sampled to construct a $97 \%$ interval with a margin of error equal to 0.07 to estimate the proportion.
The region should sample $\square$ additional voters. (Round up to the nearest integer.)