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nonpooled independent samples t-interval method
+1
vote
322
views
asked
Dec 7, 2018
in
Statistics
by
Rathin
(
820
points)
statistics
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1
Answer
0
votes
answered
Dec 7, 2018
by
Rathin
(
820
points)
The test statistic is :
t
=
ˉ
x
1
−
ˉ
x
2
s
p
√
1
n
1
+
1
n
2
The degrees of freedom are found using a complicated approximation formula. You won’t have to do that calculation "by hand", but is done by:
D
F
=
(
s
2
1
n
1
+
s
2
2
n
2
)
2
1
n
1
−
1
(
s
2
1
n
1
)
2
+
1
n
2
−
1
(
s
2
2
n
2
)
2
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