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Review Questions V
1.
A psychologist suspected that even if only two colours were used in the Droop experiment there
would be both interference and facilitation: that the condition means would be different. To explore
his hypothesis, he tested 24 subjects, 8 in each of the three Droop conditions: control, congruent,
and incongruent.
Interference is the difference between the control and the incongruent conditions. Facilitation is the
difference between the control and the congruent conditions. First analyze this as a completely
Randomized Design. Provide all descriptive stats, figures, test of assumptions, and contrasts.
Do the data below support his hypothesis?
control
congruent incongruent
150
120
200
130
110
180
160
150
210
140
100
230
120
90
180
125
130
180
140
140
220
110
120
190
2. Now analyze it as a Repeated Measures design. Each row is to be considered a subject.
3. What are the differences between the Newman-Keuls, the Tukey HSD, and the Tukey WHS tests.
Why would the different test exist?