A controlled experiment is one in which ________.
A)there are at least two groups, one differing from the other by two or more variables
B)the experiment is repeated many times to ensure that the results are accurate
C)the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data
D)there are at least two groups, one of which does not receive the experimental treatment

Question

Quizplus · Accepted Answer

A controlled experiment is one in which there are at least two groups, one of which does not receive the experimental treatment. This allows for the comparison of the results between the group that received the treatment and the group that did not, making it possible to determine the impact of the treatment on the outcome of interest while controlling for other variables that may influence the outcome. The other options (A, B, and C) do not accurately describe what a controlled experiment is.

A Controlled Experiment Is One in Which ________