Math Destroyer Test 1 #39

[DarkVoid11]

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I understand the use of the variance formula and taking the square root of it to get the std. deviation. But I was taught to subtract the # of samples with 1.

I.e. the denominator of the std. deviation/variance formula is "n-1" and not just "n".

Is it a big difference?

 

[woobb]

I think you use "n-1" for sample variance while you use just "n" for populations/the whole set.

 

[DAT Destroyer]

I understand the use of the variance formula and taking the square root of it to get the std. deviation. But I was taught to subtract the # of samples with 1.

I.e. the denominator of the std. deviation/variance formula is "n-1" and not just "n".

Is it a big difference?

You divide by n - 1 if the question specifically states that it's a sample. Otherwise we divide by n

 

[DarkVoid11]

You divide by n - 1 if the question specifically states that it's a sample. Otherwise we divide by n

Thanks!