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If an experimental group's mean of 60 is a better outcome than the control group's mean of 55

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If an experimental group's mean of 60 is a better outcome than the control group's mean of 55, and the standard deviation is 10, then the d-index equals:

a.
.50

b.
5.0

c.
2.0

d.
.05

c

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If an experimental group's mean of 60 is a better outcome than the control group's mean of 55, and the standard deviation is 10, then the d-index equals:

b.
5.0
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