A simple random sample of 60 blood donors is taken to estimate the proportion of

ID: 3230205 • Letter: A

Question

A simple random sample of 60 blood donors is taken to estimate the proportion of donors with type A blood with a 95% confidence interval. In the sample, there are 10 people with type A blood. What is the margin of error for this confidence interval?

a.) 0.048 b.) 1.96 c.) 0.094 d.) 0.079

Explanation / Answer

here p=(10/60) =1/6

std error of mean =(p|(1-p)/n)1/2 =0.048

for 95% CI, z=1.96

hence margin of errror =z*std error=1.96*0.048= 0.094

option C

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A simple random sample of 60 blood donors is taken to estimate the proportion of

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