In a one factor between groups design having four groups, there are six possible two-group comparisons that should be made at the end of the experiment. If alpha is set at .05, and the experimenter uses separate t tests to compare the group means, the experiment wise probability of a Type I error is _____
a. .05
b. .30
c. .60
d. impossible to determine without more information
C
For every comparison made, alpha (here .05) must be added to the experiment wise probability of at Type I error. Here there are 6 comparisons that must be made; therefore 6(.05) or .30 is the experiment wise probability of a Type I error.
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