To help determine if the conditions in a study truly differed
A) the experimenter should reduce the sample size.
B) at least three conditions need to be included.
C) a manipulation check is included.
D) a standard one-way ANOVA should be applied.
Question 2
It is advisable in an experiment to
A) include more than two levels of the independent variable.
B) use nominal scales for dependent variable measurements.
C) have no more than 30 participants in each group.
D) have at least 50 participants in at least one of the groups.
Model of a sequential study in which two cohorts were followed beginning at age 20. One cohort was f
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