A random sample of 50 suspension helmets used by a motorcycle riders and automobile race-car drivers was subjected to an impact test, and on 18 of these helmets some damage was observed. (a) Give a point estimate for the population proportion of helmets of this type that would show damage on this test. (b) Give the estimated standard error for the estimate in part (a). (c) Compute the 95% Wilson confidence interval for the population proportion of helmets of this type that would show damage on this test.