For a population with a standard deviation of 20, how large a smaple is necessary t have a standard

Mathematics
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For a population with a standard deviation of 20, how large a sample is necessary to have a standard error that is 
A.  less than or equal to 5 points
B.  Less than or equal to 2 points
C.  Less than or equal to 1 point

Nov 15th, 2014

Standard error =standard deviation/sqrt(n)

A. 16  

B. 100 

C. 400 

Nov 15th, 2014

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Nov 15th, 2014
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Nov 15th, 2014
Dec 6th, 2016
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