Categorical variables like a subject's gender or ethnicity are known as which type of variable in experimental research?
A)blocking variables
B)covariates
C)main variables
D)confounds

Question

Quizplus · Accepted Answer

Categorical variables are often used as blocking variables in experimental research to control for potential sources of variation that may be related to the categorical variable. For example, gender may be used as a blocking variable to ensure that an equal number of males and females are assigned to each condition of the experiment, thus controlling for the potential influence of gender on the result.

Categorical Variables Like a Subject's Gender or Ethnicity Are Known