Explaining the difference between standard deviation and
standard error
Under what circumstance is a t statistic used instead of a
z-score for hypothesis test?
– when o is known
– when o is unknown
– 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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