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#1

Hi All,

I have a question about the formula for Z-scores. I've seen the formula as:

a) Z-Score = (observation - mean) / standard deviation

and as:

b) Z-Score = (sample mean - population mean) / (standard deviation / SQRT(sample size))

Thus far, I've been using formula "a" above. When would we use formula "b"?

Thanks!

I have a question about the formula for Z-scores. I've seen the formula as:

a) Z-Score = (observation - mean) / standard deviation

and as:

b) Z-Score = (sample mean - population mean) / (standard deviation / SQRT(sample size))

Thus far, I've been using formula "a" above. When would we use formula "b"?

Thanks!

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