We want to estimate the skid distance of a Firestone radial tire of known tread design


We want to estimate the skid distance of a Firestone radial tire of known tread design

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We want to estimate the skid distance of a Firestone radial tire of known tread design. Suppose we have computed the population mean and variance to be 50 feet and 25 feet-squared. (a) Compute the minimum sample size required for a 95 percent-confidence margin of error of two inches on the mean skid distance.

           (b) If we test 50 tires and find the sample mean is 52.3 feet, form an interval estimate for the population mean.

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