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A random sample of medical files is used to estimate the

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A random sample of medical files is used to estimate the proportion p of all people who have blood type b.

(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 p will be within a distance of 0.07 from p?

______medical files

(b) Answer part (a) if you use the preliminary estimate that about 13 out of 90 people have blood type B.

_______ medical files

Reference no: EM13636743

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