Question

​It's believed that as many as 24​% of adults over 50 never graduated from high school. We wish to see if this percentage is the same among the 25 to 30 age group.

​a) How many of this younger age group must we survey in order to estimate the proportion of​ non-grads to within 8​% with​ 90% confidence? n=_____________ ​(Round up to the nearest​ integer.) ​

b) Suppose we want to cut the margin of error to 5​%. What is the necessary sample​ size? n

n=_______________ ​(Round up to the nearest​ integer.) ​

c) What sample size would produce a margin of error of 4​%.

n=_____________  ​(Round up to the nearest​ integer.)

Answer 1

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