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158 Appendix A: Tables and Reference Information
where the computation of S and df are dependent on whether the
variances are pooled. If the variances are not pooled:
otherwise:
and Sxp is the pooled variance.
S
Sx
1
2
n
1
----------
Sx
2
2
n
2
----------+=
d
f
Sx
1
2
n
1
----------
Sx
2
2
n
2
----------+
2
1
n
1
1–
--------------
Sx
1
2
n
1
----------
2
1
n
2
1–
--------------
Sx
2
2
n
2
----------
2
+
--------------------------------------------------------------------------=
Sx
p
n
1
1–()Sx
1
2
n
2
1–()Sx
2
2
+
df
-------------------------------------------------------------------=
S
1
n
1
-----
1
n
2
-----
Sx
p
+=
df n
1
n
2
2–+=