How much is exactly in the difference between a t-score and z-score for the same data?

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Daniel Wright

It will depend on the sample size. If the sample is large the two will be very close. You will see at the bottom of many t-tables a row for df = infinity and then it follows the normal (z) distribution.

Robert James McClelland

Sergio

Try this:

Z-score = T-score - Reference T-score

T-score = Z-score + Reference T-score

Suchira Suranga

Try this

http://www.differencebetween.net/miscellaneous/difference-between-z-test-and-t-test/

Sergio Dominguez Lara

Thank you very much for your answers, they were useful.