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stats question, calculating z

SarcasticDwarf

Diamond Member
Maybe someone can explain this to me, because I sure as hell am confused. I am looking through past examples of work in my business stats class. It seems that two different but similar equations are being used for the same type of problem.

In one:
x-bar minus Mu
over
alpha divided by the square root of n

Where alpha is the error allowed.

In others I see

x-bar minus Mu
over
sigma divided by the square root of n

Where sigma is the standard deviation.




So I am confused. The standard deviation is not the same as the accepted error.
 
Originally posted by: SarcasticDwarf
Maybe someone can explain this to me, because I sure as hell am confused. I am looking through past examples of work in my business stats class. It seems that two different but similar equations are being used for the same type of problem.

In one:
x-bar minus Mu
over
alpha divided by the square root of n

Where alpha is the error allowed.

In others I see

x-bar minus Mu
over
sigma divided by the square root of n

Where sigma is the standard deviation.




So I am confused. The standard deviation is not the same as the accepted error.

Sorry I don't have anything useful to say except that I remember how I hated that crap in college.
 
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