When using standard errors to calculate probabilities of events occurring by chance, how do you know when to use z scores and when to use t values?

Name: When using standard errors to calculate probabilities of events occurring by chance, how do you know when to use z scores and when to use t values?
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The Answer of When using standard errors to calculate probabilities of events occurring by chance, how do you know when to use z scores and when to use t values?

When Using Standard Errors to Calculate Probabilities of Events Occurring