Question

Question Heip Atre manufacturer would ke to esimate the average tire lide of its new all-eason light thuck fre in tem of how many mles las Detemine the sample sze needed to construct a 9% confidence inerval with a margn of emor equal to 3,100 miles Assume the standand deviation for the Sre life of this partoular brand is 7,000mies The sample size needed is (Round sp to the nearest integer )

A tire manufacturer would like to estimate the average tire life of its new all-season light truck tire in terms of how many miles it lasts. Determine the sample size needed to construct a 98% confidence interval with a margin of error equal to 3,100 miles. Assume the standard deviation for the tire life of this particular brand is 7,000 miles.

Answer 1

ܘ |3> ܒܘܨ ܘ ܘ ܒ - - ca ܘ ܘ ܕ ܕ 2 ? ܘ ܦ 30 ܦ ܘܝܒܝܼ . 24 ܘܘ 31 - (33 - 2 ) ܟ ܐܐ ܘ ܒ ܘܕܓ 4(.ܘ3 ،