math question?

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A survey is to be taken to determine the average age of readers of the Wall Street Journal. How large of a sample should be selected in order to estimate the average age of the readers to within 2 years with a 95% confidence? A reasonable estimate of the standard deviation is 5 years

a. 35

b. 60

c. 100

d. 24

2006-10-28 12:26:52 · 4 answers · asked by mrkittypong 5 in Science & Mathematics ➔ Mathematics

4 answers

2006-10-28 12:29:27 · answer #1 · answered by Anonymous · 0⤊ 0⤋

At least 100

2006-10-28 19:30:04 · answer #2 · answered by smarties 6 · 0⤊ 0⤋

C. For the best accuracy you must have the largest sample size.

2006-10-28 19:28:55 · answer #3 · answered by garh760 2 · 0⤊ 0⤋

C you want the bigest amount of people posible

2006-10-28 19:32:21 · answer #4 · answered by colliflower 2 · 0⤊ 0⤋