How large a sample is necessary to 95% surety that the estimate of the mean income...
How large a sample is necessary to 95% surety that the estimate of the mean income of graphic artists is within $250 of the true mean? The standard deviation of the income is $900.
Homework Answers
Answer:
c= 95%, E= $250, 
= $900
formula to calculate sample size is
where Zc is the z critical value for c= 95%
Zc= 1.96
n =49.787136
n= 50
necessary sample size is = 50
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