Question

Internal validity is primarily determined by the quality of the _____________, which is in turn determined by the degree or amount of ___________.

A) Participants; Control
B) Measurement; Confounding
C) Design; Extraneous variables
D) Analysis; Bias

Answer 1

The quality of an experimental design determines its internal validity, and this is affected by how well extraneous variables are controlled.

Step-by-step explanation:

Internal validity is primarily determined by the quality of the design, which is in turn determined by the degree or amount of extraneous variables. Therefore, the correct answer is C) Design; Extraneous variables. Experiments must be carefully designed to control or eliminate extraneous variables, ensuring that no factors other than the independent variable are influencing the outcome of the study. This control is accomplished by using a variety of techniques, such as randomization, use of control groups, and perhaps blinding participants and researchers to the conditions to which participants are assigned (double-blind studies), to prevent experimenter bias and placebo effects from skewing the results.