A random sample of 50 lumbar supports used by go-cart racers were subjected to a crash test, and tear was observed on 18 of these lumbar supports. Using the point estimate of p from the 50 supports, how many lumbar supports must be tested to be 95% confident that the error in estimating p is less than 0.02? а. 2213 b.2212 c. None of the above d. 2401

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A:

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