5.36. A television network plans to predict the outcome of an election between Jacalyn Levin and Roberto 5.37. A public health unit wants to sample death records for the past year in Toronto to estimate the proportion of the deaths that were due to accidents.

Health officials want the estimate to be accurate to within 0.02 with probability 0.95.

(a) Find the necessary sample size if, based on previous studies, officials believe that this proportion docs not exceed 0.10.

(b) Suppose that in determining the necessary sample size, officials use the safe approach that sets tt = 0.50 in the appropriate formula.

Then how many records need to be sampled?

Compare the result to the answer in part (a), and note the reduction in sample size that occurs by making an educated guess for tt.