A random sample of medical files is used to estimate the proportion p of all people who have blood type B. I USE SALT (a) If you have no preliminary estimate for p, how many medical files should you include in a random sample in order to be 85% sure that the point estimate will be within a distance of 0.04 from p? medical files (b) Answer part (a) if you use the preliminary estimate that about 12 out of 90 people have blood type B. (Round your answer up to the nearest whole number.) medical files

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