AP PSYCHOLOGY

Detailed explanation-1: -A controlled experiment is simply an experiment in which all factors are held constant except for one: the independent variable. A common type of controlled experiment compares a control group against an experimental group. All variables are identical between the two groups except for the factor being tested.

Detailed explanation-2: -An experiment in which only one variable is manipulated at a time is called a controlled experiment.

Detailed explanation-3: -The independent variable, also known as the manipulated variable, is the factor manipulated by the researcher, and it produces one or more results, known as dependent variables.

Detailed explanation-4: -Therefore, in experiments, a researcher manipulates an independent variable to determine if it causes a change in the dependent variable.

Detailed explanation-5: -As long as the experiment is repeated a sufficient number of times, it does not matter how many variables are used. D. Yes, an experiment should test only one variable at a time. This ensures that the experimental outcome is clearly due to one identifiable factor.