​Which of the following is correct?​

Correct option is A

Introduction:

A factorial design (or factor design) is a type of experimental design in research where two or more independent variables (factors) are studied simultaneously to observe their individual and interaction effects on a single dependent variable.

Information Booster:

• In a factorial design:

1. One dependent variable is measured.

2. Two or more independent variables (factors) are manipulated.

• The main purposes of factorial design:

1. To study main effects of each independent variable.

2. To examine interaction effects between independent variables.

• Example: A 2×2 factorial design studies 2 independent variables, each with 2 levels (e.g., gender: male/female and teaching method: traditional/online).

Additional Knowledge:

• Not correct:

• “Used for extraneous variables”: Extraneous variables are controlled, not manipulated in factor design.

• “Has only one independent variable”: That would be a single-factor design, not factorial.

• “Used for two or more dependent variables”: That refers to multivariate designs (MANOVA), not factorial.