A one-factor, between-subjects ANOVA involves three groups of eight subjects each. The means of the three groups are m1 = 4, m2 = 6, and m3 = 8. Therefore, the value of the contrast defined by the weight vector w = [–.5, 1, –.5] is ______.
a. 0
b. 2
c. 1
d. –2
Ans: A
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