In an experiment, control over extraneous variables, such as the time of day or the temperature of the room, can be obtained by
A)using a double-blind.
B)making all conditions except the independent variable exactly the same for all subjects.
C)using repeated measures.
D)observing and recording the impact of each variable on each subject in the experiment..

Question

Quizplus · Accepted Answer

Making all conditions except the independent variable exactly the same for all subjects allows for control of extraneous variables. This helps to ensure that any observed effects can be attributed to the independent variable, rather than other factors that may differ between subjects or conditions. The other options (double-blind, repeated measures, observing and recording) may be useful in other contexts or for other purposes, but do not directly address the issue of controlling extraneous variables.

In an Experiment, Control Over Extraneous Variables, Such as the Time