In a controlled experiment, _______________.
A)the researcher controls for the effects of all variables except one
B)the researcher knows the outcome before beginning the experiment
C)the researcher has several hypotheses,one of which will be proven correct
D)you need only a single experimental organism which is tested again and again
E)the researcher controls for the effects of only one variable

Question

Quizplus · Accepted Answer

In a controlled experiment, the researcher manipulates and controls for the effects of all variables except one, in order to isolate the impact of that specific variable on the outcome being measured. This is done in order to establish cause-and-effect relationships between variables. Therefore, option A is the best choice.

In a Controlled Experiment, _______________