For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding. A random sample of medical files is used to estimate the proportion p of...


For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding.


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



(a) If you have no preliminary estimate forp, how many medical files should you include in a random sample in order to be 85% sure that the point estimate p̂ will be within a distance of 0.07 fromp? (Round your answer up to the nearest whole number.)
 =__medical files


(b) Answer part (a) if you use the preliminary estimate that about 12 out of 90 people have blood type B.
 =__medical files

For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding.


How hard is it to reach a businessperson by phone? Letp be the proportion of calls to businesspeople for which the caller reaches the person being called on thefirst try.

(a) If you have no preliminary estimate forp, how many business phone calls should you include in a random sample to be 80% sure that the point estimate p̂ will be within a distance of 0.03 fromp? (Round your answer up to the nearest whole number.)
 =__phone calls


(b) A report states that businesspeople can be reached by a single phone call approximately 14% of the time. Using this (national) estimate forp, answer part (a). (Round your answer up to the nearest whole number.)
 =__phone calls




Jun 07, 2022
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