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Sagot :
The sample size required is 1725.
(A) Sample size calculation
p=0.15
For 98%, z=2.326
d=0.02
Sample size = (z^2*p*(1-p))/d^2
= (2.326^2*0.15*0.85)/0.02^2
=1724.5
The sample size required= 1725
(B) Sample size calculation
p=0.5
For 98%, z=2.326
d=0.02
Sample size = (z^2*p*(1-p))/d^2
= (2.326^2*0.5*0.5)/0.02^2
= 3381.4
The sample size required= 3382
In records, the pattern size is the degree of the variety of character samples utilized in a test. For example, if we're testing 50 samples of folks that watch television in a town, then the pattern length is 50.
Sample size willpower is the act of selecting the range of observations or replicates to consist of in a statistical pattern. The sample size is a crucial function of any empirical look at in which the intention is to make inferences about a populace from a sample.
Your question is incomplete. Please find the complete question below.
A researcher for the U.S. Department of the Treasury wishes to estimate the percentage of Americans who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 2 percentage points with98% confidence if
(a) Does he use a 2006 estimate of 15% obtained from a Coinstar National Currency Poll?
(b) he does not use any prior estimate?
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