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The group in an experimental design that receives the intervention or treatment of interest. It is compared with a control group to see the effects of the intervention.

A research method that compares multiple segments of a population at a single moment in time. It is used to analyze data collected from a population, or a representative subset, at a specific point.

A research method that shares similarities with an experimental design or randomized controlled trial, but specifically lacks the element of random assignment to treatment or control. It is used when randomization is not feasible.

A research method that involves asking questions of people or collecting data from documents. Surveys are used to gather information about attitudes, beliefs, or behaviors from a large group of people.

An observational research method in which data is gathered for the same subjects repeatedly over a period of time. It is used to study developmental trends across the life span.

A research method in which an investigator manipulates one or more variables to observe the effect on some behavior or mental process. It's used when seeking to establish a cause-and-effect relationship.

A statistical technique for combining the findings from independent studies. It is used to assess the clinical effectiveness of healthcare interventions and to plan future research.

An experiment conducted in the natural environment of the participants. The researcher manipulates independent variables but does so in a real-life setting. It is used to establish cause and effect in a more natural context.

An in-depth examination of an individual or group. It is often used to explore unique cases that cannot be replicated for ethical or practical reasons.

A research method that examines the extent to which two variables are associated. It is used when determining a statistical relationship, rather than cause and effect.

In experimental research, the group that does not receive the experimental treatment. Instead, it might receive no treatment or a standard treatment. It is used as a benchmark to measure how the other tested subjects do.