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Question 42 of 50 What is a dummy variable? 0 A. a variable that indicates the absence or presence of some numerical effect that may be expected to shift the outcome in regression analysis 0 B. a placeholder value inserted into multiple regression analyses to ensure that predicted values take on a rational number 0 C. a control variable used in multiple regression that is not measured but ultimately enhances statistical accuracy 0 D. a variable that takes on a value of 0 or 1 to describe the effects of the different levels of a predictor in a regression analysis Reset Selection