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TI-83 Plus Tables and Reference Information 726
2
.
SampTTest
The following is the definition for the
2
.
SampTTest
. The two-sample
t
statistic with degrees of freedom
df
is:
S
xx
t
21
−
=
where the computation of
S
and
df
are dependent on whether the
variances are pooled. If the variances are not pooled:
2
2
2
1
2
1
n
Sx
n
Sx
S
+=
2
2
2
2
2
2
1
2
1
1
2
2
2
2
1
2
1
1
1
1
1
−
+
−
+
=
n
Sx
nn
Sx
n
n
Sx
n
Sx
df
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