A random sample of 35 lumbar supports used by motorcycle riders and automobile race-car drivers were subjected to crash test, and damages were observed on some of the supports. Find a 95% two- sided confidence interval on the true proportion of helmets that would show damage from this test. a. None of the above O b.0.227 sps 0.493 O c. Insufficient Data O d. 0.226 sp s 0.492

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