STATISTICAL TECHNIQUES AND TOOLS
MULTIPLE REGRESSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An interaction
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is a second-order term
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causes the linear model to convert to a plane
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must have crossing contour lines
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is mediation
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Explanation:
Detailed explanation-1: -in analysis of variance or regression analysis, an effect in which three independent variables combine to have a nonadditive influence on a dependent variable.
Detailed explanation-2: -A second order (k=2) polynomial forms a quadratic expression (parabolic curve), a third order (k=3) polynomial forms a cubic expression and a fourth order (k=4) polynomial forms a quartic expression.
Detailed explanation-3: -A statistically significant two-way interaction indicates that there are differences in the influence of each independent variable at their different levels (e.g., the effect of a1 and a2 at b1 is different from the effect of a1 and a2 at b2).
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