SOLUTION: How many students must be randomly selected to estimate the mean weekly earnings of students at one college? We want 95% confidence that the sample mean is within $3 of the popula

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Question 866340: How many students must be randomly selected to estimate the mean weekly earnings of students at one
college? We want 95% confidence that the sample mean is within $3 of the population mean, and the population standard deviation is known to be $42.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

3+=+1.96%2842%2Fsqrt%28n%29%29

 n+=+%281.96%2A42%2F3%29%5E2 = 752.9536,  753  Students



CI	z -value

90%	z =1.645

92%	z = 1.751

95%	z = 1.96

98%	z = 2.326

99%	z = 2.576