What term describes changes caused by extraneous or unknown variables rather than the hypothesized independent variable?

What term describes changes caused by extraneous or unknown variables rather than the hypothesized independent variable?

• A. Alternate Operating Variables
• B. Time factor
• C. Concomitant variation
• D. Placebo

Answer: (A)

The main idea here is that effects in a study should come from the hypothesized independent variable, not from other unknown or outside factors. When other factors vary in ways that influence the outcome, they can obscure or mimic the true effect of the independent variable—that’s a confounding issue created by extraneous variables. Among the given terms, the one that best fits this situation is concomitant variation, which describes two things varying together. If an extraneous or unknown variable changes alongside the independent variable and the dependent outcome shifts accordingly, you’d observe concomitant variation, signaling potential confounding. The other options don’t capture this idea as directly: one is not a standard term for this context, time factor is a possible kind of extraneous influence, and placebo relates to expectation effects rather than uncontrolled variables broadly. In practice, researchers aim to identify and control such extraneous factors to reveal the true effect of the independent variable.

The main idea here is that effects in a study should come from the hypothesized independent variable, not from other unknown or outside factors. When other factors vary in ways that influence the outcome, they can obscure or mimic the true effect of the independent variable—that’s a confounding issue created by extraneous variables. Among the given terms, the one that best fits this situation is concomitant variation, which describes two things varying together. If an extraneous or unknown variable changes alongside the independent variable and the dependent outcome shifts accordingly, you’d observe concomitant variation, signaling potential confounding. The other options don’t capture this idea as directly: one is not a standard term for this context, time factor is a possible kind of extraneous influence, and placebo relates to expectation effects rather than uncontrolled variables broadly. In practice, researchers aim to identify and control such extraneous factors to reveal the true effect of the independent variable.