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Explaining the difference between standard deviation and standard error

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Under what circumstance is a t statistic used instead of a z-score for hypothesis test?
- when o is known
- when o is unknown (this is the one i had chosen)
- when o is small
- when o is large

A sample of n=25 scores has a mean of M= 83 and a standard deviation of s=15. Explain what is measured by the sample standard deviation.

Compute the estimated standard error for the sample mean, and explain what is measured by the standard error.

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The solution gives detailed steps on explaining difference between standard deviation and standard error.

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Under what circumstance is a t statistic used instead of a z-score for hypothesis test?
- when o is known (I choose this one, I am sure of my answer)
- when o is unknown
- when o is small
- when o is large

A ...

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