# stastics

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I'm having a hard time with question, can someone help me?

A random sample of medical files is used to estimate the proportion p of all people who have blood type B. 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 Final26main will be within a distance of 0.1 from p?

208
8
4
104
52

• stastics -

n=p(1-p(Zc/E)sqrd
=(.5)(.5)(1.44/.1)sqrd
=51.84
=52

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