The number of levels of the independent variable is 6. How many orthogonal contrasts can be tested?
a. 1
b. 3
c. 5
d. 6
orthogonal contrasts can be tested = 5 (c).
[ explanation:-
number of levels of the independent variable(k) = 6
number of orthogonal contrasts = (k-1) = (6-1) = 5 ]
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