Experimental Design Flashcards
(19 cards)
Hindsight Bias
the tendency to believe, after learning an outcome, that we would have foreseen it. (Also known as the I-knew-it-all-along phenomenon.)
scientific theory
explains through an integrated set of principles that organizes observations and predicts behaviors or events
hypothesis
a testable prediction, often implied by a theory.
operational definition
a statement of the procedures (operations) used to define research variables. For example, human intelligence may be operationally defined as “what an intelligence test measures.”
replication
repeating the essence of a research study, usually with different participants in different situations, to see whether the basic finding extends to other participants and circumstances.
case study
an observation technique in which one person is studied in depth in the hope of revealing universal principles.
survey
a technique for ascertaining the self-reported attitudes or behaviors of a particular group, usually by questioning a representative, random sample of the group.
random sample
a sample that fairly represents a population because each member has an equal chance of inclusion.
naturalistic observation
observing and recording behavior in naturally occurring situations without trying to manipulate and control the situation.
correlation
the extent to which two factors vary together, and thus of how well either factor predicts the other. The correlation coefficient is the mathematical expression of the relationship, ranging from –1 to +1.
experiment
a research method in which an investigator manipulates one or more factors (independent variables) to observe the effect on some behavior or mental process (the dependent variable). By random assignment of participants, the experimenter aims to control other relevant factors.
random assignment
assigning participants to experimental and control groups by chance, thus minimizing preexisting differences between those assigned to the different groups.
experimental group
in an experiment, the group that is exposed to the treatment, that is, to one version of the independent variable.
control group
in an experiment, the group that is not exposed to the treatment; contrasts with the experimental group and serves as a comparison for evaluating the effect of the treatment.
double-blind procedure
an experimental procedure in which both the research participants and the research staff are ignorant (blind) about whether the research participants have received the treatment or a placebo. Commonly used in drug-evaluation studies. (p. 22)
independent variable
the experimental factor that is manipulated; the variable whose effect is being studied.
dependent variable
the outcome factor; the variable that may change in response to manipulations of the independent variable.
illusory correlation
the perception of a relationship where none exists.
placebo effect
experimental results caused by expectations alone; any effect on behavior caused by the administration of an inert substance or condition, which the recipient assumes is an active agent.
