In AP Psychology, a research method is the specific strategy a psychologist uses to collect data and test a hypothesis, such as an experiment, correlational study, case study, naturalistic observation, survey, or meta-analysis. Only the experiment can establish cause and effect.
A research method is the game plan behind a psychology study. It answers the question "how exactly did the researchers gather their data?" Common methods you need to recognize include the experiment (the researcher manipulates a variable and measures its effect), the correlational study (variables are measured, not manipulated, to see if they relate), the case study (an in-depth look at one person or a small group), naturalistic observation (watching behavior in its real-world setting without interfering), the survey (asking people to self-report), and meta-analysis (statistically combining results from many studies).
Here's the hierarchy that trips people up. "Research method" is the umbrella term, and each of those study types sits underneath it. The method you choose determines what you're allowed to conclude. Manipulate a variable with random assignment and you can claim causation. Just measure or observe and you can only claim a relationship or a description. Topics 1.2 (Research Methods in Psychology) and 1.4 (Selecting a Research Method) cover when each method fits, because some questions can't ethically or practically be studied with an experiment. You can't randomly assign kids to neglectful parents, so you study that correlationally instead.
Research methods anchor Topics 1.1, 1.2, and 1.4 at the start of the course, but they don't stay there. Every unit's findings come from some method, and the revised exam tests whether you can tell which one. Even the Unit 1 biology content depends on methods. Learning objective 1.1.A asks you to explain how heredity and environment interact, and psychologists answer that with twin and family studies, which are correlational methods. Learning objective 1.4.A connects brain structures to behavior, and a lot of that evidence comes from case studies of patients with brain damage. The biggest payoff is the Article Analysis Question (AAQ), a free-response question built entirely around a real study summary. If you can't name the research method, the rest of the AAQ falls apart.
Keep studying AP Psychology Unit 1
Experimental Design (Unit 1)
The experiment is the one research method that earns causal language. If a study manipulates an independent variable and uses random assignment, it's an experiment. If not, no matter how scientific it looks, you cannot say one variable caused the other.
Observational Study (Unit 1)
Naturalistic observation trades control for realism. Watching students behave in an actual classroom captures genuine behavior, but the researcher can't manipulate anything, so the findings are descriptive rather than causal.
Neurodevelopmental and Schizophrenic Spectrum Disorders (Unit 8)
Method choice shows up again when psychologists study disorders like autism spectrum disorder, ADHD, and schizophrenia. You can't ethically induce a disorder, so this research leans on case studies, correlational designs, and longitudinal tracking instead of true experiments.
Heredity and Environment (Unit 1)
The nature-nurture question from learning objective 1.1.A is really a research methods question. Twin and adoption studies are clever correlational methods that let researchers estimate how much genes and environment each contribute without manipulating either one.
The AAQ free-response question hands you a summary of a real study (the 2025 AAQ described a misinformation-and-memory study with 127 student participants) and one of the first things you do is identify the research method and justify your answer using details from the article. Look for the giveaways. Manipulation plus random assignment means experiment. Measuring two existing variables means correlational. One unusual individual means case study. Multiple-choice questions test the same skill from the other direction. A stem describes a scenario, like a researcher manipulating variables to measure their impact, or a psychologist analyzing behavior patterns in a classroom, and asks which method fits. Practice questions also ask why a researcher would pick a method, such as choosing a case study to deeply examine a rare condition. The skill is always matching method to scenario and knowing what conclusions each method permits.
Students often use "experiment" to mean any psychology study, but an experiment is just one research method among several. A study only counts as an experiment if the researcher manipulates an independent variable and randomly assigns participants to conditions. Surveys, case studies, and correlational studies are research methods too, and calling them experiments on the AAQ costs you points because it implies causation the design can't support.
A research method is the overall strategy for collecting data, and the main types are experiments, correlational studies, case studies, naturalistic observation, surveys, and meta-analyses.
Only an experiment, which manipulates an independent variable and uses random assignment, can establish cause and effect; every other method describes or correlates.
On the AAQ, you identify the study's research method and defend your answer with specific details from the article summary.
Researchers select methods based on the question and on ethics, which is why disorders like schizophrenia or ASD are studied with case studies and correlational designs rather than experiments.
Twin and adoption studies are correlational research methods psychologists use to untangle heredity from environment, linking methods directly to learning objective 1.1.A.
A research method is the specific strategy used to gather data and test a hypothesis, such as an experiment, correlational study, case study, naturalistic observation, survey, or meta-analysis. It's covered in Topics 1.2 and 1.4 of the course.
No. A study is only an experiment if the researcher manipulates an independent variable and randomly assigns participants. Surveys, case studies, and correlational studies are non-experimental methods, and mislabeling them as experiments is a common point-loser on the AAQ.
Research method is the broad category of study (experiment, case study, survey), while design refers to the specific setup within that method, like which variables are manipulated and how participants are assigned to groups. On the exam, identify the method first, then describe design details like the independent and dependent variables.
Only the experiment, because manipulating an independent variable while randomly assigning participants rules out other explanations. Correlational studies can show that two variables relate, but never that one caused the other.
Look for the design clues in the article summary. If participants were randomly assigned to conditions and a variable was manipulated, it's an experiment; if variables were just measured and compared, it's correlational; if one person or small group was studied in depth, it's a case study. Then cite a specific detail from the study, like the 127 participants being assigned to misinformation conditions, to justify your label.