In a clinical trial of a certain drug, 14 subjects experience headaches among the 221 subjects treated with the drug. Construct a 99% (Wald) confidence interval estimate for the proportion of treated subjects who experience headaches, completing parts (a) through (d) below.
a. Find the best point estimate of the population proportion. 0.063 (Type an integer or a decimal rounded to three decimal places as needed.)
b. Identify the value of the margin of error E. nothing (Type an integer or a decimal rounded to three decimal places as needed.)
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