AP PSYCHOLOGY

Detailed explanation-1: -An experiment is a type of empirical study that features the manipulation of an independent variable, the measurement of a dependent variable, and control of extraneous variables.

Detailed explanation-2: -The foundations of quantitative research are variables and there are three main types: dependent, independent and controlled. The researcher will manipulate an independent variable in an effort to understand its effect on the dependent or controlled variable.

Detailed explanation-3: -Qualitative and quantitative variables are purposefully manipulated by the researcher and are not present within the research participants prior to their participation in the study. Classification variables, by contrast, are those that are inherent to the research participants and not introduced by the researchers.

Detailed explanation-4: -Quantitative variables are any variables where the data represent amounts (e.g. height, weight, or age). Categorical variables are any variables where the data represent groups. This includes rankings (e.g. finishing places in a race), classifications (e.g. brands of cereal), and binary outcomes (e.g. coin flips).