Which of the following descriptions of a main effect is correct? (Points : 0.1)

Question

Which of the following descriptions of a main effect is correct? (Points : 0.1) A main effect of an independent variable must have effect over at least one level of all other variables A main effect of an independent variable must not have any effects for all levels of all of the independent variables A main effect of a variable is the effect of the variable at a single level of another variable A main effect of an independent variable is the effect of the variable averaging over the levels of the other variable(s)

Explanation / Answer

In the design of experiments and analysis of variance, a main effect is the effect of an independent variable on a dependent variable averaging across the levels of any other independent variables.

Hence answer is A main effect of an independent variable is the effect of the variable averaging over the levels of the other variable(s)

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