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Give at least two means.

Mean 1 (E):
Mean 2 (O,C):
N of Cases 1:
N of Cases 2:
Std Dev 1:
Std Dev 2:
Width of C.I.:
or 1-alpha


One Sample:
Equal Variance:
Confidence Intervals:
Effect Size:
Swap Input:

T-test procedure.
To compare the difference between
two means, two averages, two
proportions or two counted numbers.
The means are from two independent
sample or from two groups in the
same sample. A number of additional
statistics for comparing two groups
are further presented. More....