Medical: Blood Type A random sample of medical files is used to estimate the proportion p of

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Medical: Blood Type 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 pˆ will be within a distance of 0.05 from p?

(b) Answer part

(a) if you use the preliminary estimate that about 8 out of 90 people have blood type B (Reference: Manual of Laboratory and Diagnostic Tests by F.

Fischbach).

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