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What is the minimal sample size needed for a 95% confidence interval to have a maximal...

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Statistics

What is the minimal sample size needed for a 95% confidenceinterval to have a maximal margin of error of 0.1 in the followingscenarios? (Round your answers up the nearest whole number.)

(a) a preliminary estimate for p is 0.31

(b) there is no preliminary estimate for p

For this problem, carry at least four digits after the decimalin your calculations. Answers may vary slightly due torounding.

A random sample of medical files is used to estimate theproportion p of all people who have blood type B.

If you have no preliminary estimate for p, how manymedical files should you include in a random sample in order to be85% sure that the point estimate p̂ will be within adistance of 0.06 from p? (Round your answer up to thenearest whole number.)

____________medical files

Answer part (a) if you use the preliminary estimate that about12 out of 90 people have blood type B.

_____________medical files

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SolutionWhat is the minimal sample size needed for a 95 confidenceinterval to have a maximal margin of error of 01 in the followingscenarios Round your answers up the nearest whole numbera a preliminary estimate for p is    See Answer
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