A random sample of 50 suspension helmets used by motorcycle riders and automobile race-car drivers was subjected to an impact test, and on 19 of these helmets some damage was observed. (a) Find a 95%...

Extracted text: A random sample of 50 suspension helmets used by motorcycle riders and automobile race-car drivers was subjected to an impact test, and on 19 of these helmets some damage was observed. (a) Find a 95% two-sided Cl on the true proportion of helmets of this type that would show damage from this test. Use z-scores with two decimal places. Round the answers to 4 decimal places. CI:( e Textbook and Media (b) Using the point estimate of p obtained from the preliminary sample of 50 helmets, how many helmets must be tested to be 95% confident that the error in estimating the true value of pis less than 0.03? n= i


Extracted text: (b) Using the point estimate of p obtained from the preliminary sample of 50 helmets, how many helmets must be tested to be 95% confident that the error in estimating the true value of pis less than 0.03? n- eTextbook and Media (c) How large must the sample be if we wish to be at least 95% confident that the error in estimating p is less than 0.03. regardless of the true value of p? n-i