Designs that do not control for extraneous factors by randomization are called ________.
A) true experimental designs
B) quasi-experimental designs
C) statistical designs
D) preexperimental designs
E) extraneous designs

Question

Quizplus · Accepted Answer

Designs that do not control for extraneous factors by randomization are called preexperimental designs, which are less rigorous than true experimental designs as they lack control over extraneous variables. Quasi-experimental designs, on the other hand, are similar to true experimental designs but lack random assignment to conditions. Statistical designs is a vague term that can refer to any design that employs statistical analysis. Extraneous designs is not a common term in experimental research.

Designs That Do Not Control for Extraneous Factors by Randomization