AP PSYCHOLOGY

Detailed explanation-1: -Descriptive studies can be of several types, namely, case reports, case series, cross-sectional studies, and ecological studies. In the first three of these, data are collected on individuals, whereas the last one uses aggregated data for groups.

Detailed explanation-2: -A descriptive study is one in which information is collected without changing the environment (i.e., nothing is manipulated). Sometimes these are referred to as “ correlational ” or “ observational ” studies.

Detailed explanation-3: -A respondent’s reason for not buying a particular product that was sent in the mail as a sample is not an example of descriptive research.