A certain region would like to estimate the proportion of voterswho intend to participate in upcoming elections. A pilot sample of25 voters found that 15 of them intended to vote in the election.Determine the additional number of voters that need to be sampledto construct a 98​% interval with a margin of error equal to 0.06to estimate the proportion.
The region should sample _______________ additional voters.​(Round up to the nearest​ integer.)
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A tire manufacturer would like to estimate the average tire lifeof its new​ all-season light truck tire in terms of how many milesit lasts. Determine the sample size needed to construct a 96​%confidence interval with a margin of error equal to 3,200 miles.Assume the standard deviation for the tire life of this particularbrand is 7,000 miles.
The sample size needed is____ . ​(Round up to the nearest​integer.)
