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727
otherwise:
df
Sx
n
Sx
n
Sx
p
2
2
2
2
1
1
)
1
(
)
1
(
−
+
−
=
p
Sx
n
n
S
2
1
1
1
+
=
2
2
1
−
+
=
n
n
df
and
Sxp
is the pooled variance.
1
...
...
728
729
730
731
732
...
...
827