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When do you use Z scores to calculate percentiles and percentile ranks?

dawnmich1

wrote...

Posts: 2

Rep:

10 years ago

When do you use Z scores to calculate percentiles and percentile ranks?

Do you always need to use Z scores?

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1 Reply

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DavidGuimont

wrote...

#1

10 years ago

Sorry, I misread your question. My eyesight is no longer correctable to 20-20 or even 20-25. I thought that you wrote why, not when.

You use Z-scores when you are working with the normal distribution and want to determine percentiles and then you always use them.

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