1
The Dependent
t
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Types of 2 sample
t
• The two sample
t
test is used to test whether
population means are equal, e.g., do training
and control groups have the same mean.
• The two samples can be independent or
dependent.
– They are independent if participants are randomly
assigned to one and only one group.
– They are dependent if participants are paired
somehow across groups
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Some Dependent Samples
• Repeated measures
– Same person is in both groups, both trained and
control (before, after)
• Family members
– Brother, sister
– Husband, wife
•F
r
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n
d
s
•T
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Computing the dependent
t
diff
X
SE
D
t
D
=
pairs
D
diff
n
SD
SE
=
Here are the formulas.
Dependent t
is easy to compute.
First you find the
difference between each pair of
scores.
You find the mean and
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 Fall '08
 Staff
 Null hypothesis, critical value, Student's ttest, tcrit

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