A characteristic that changes between individuals, such as gender, age, intelligence, weight)
Variable
A study design in which a psychologist or therapist observes one person over a long period of time
Case study
An observational study in which the researcher unobtrusively observes and records behavior in the real world
naturalistic
A research sample that accuratel reflects the population of people one is studying
Representative
A study which does not show causation, but does measure 2 or more variables and their relationship with one another
correlational
A research technique for combining all research results on one question and drawing a conclusion
meta-analysis
(2 words seperated by a space)A measure of the strength of the relationship between two variables or the extent of an experimental effect
effect size
In an experiment, the outcome or response to an experimental manipulation
dependent variable
A variable that is manipulated by an experimenter under controlled conditions to determine whether it is caused by the predicted outcome of an experiment
independent
A variable whose influence cannot be separated from the independent variable being manipulated
confounding
A substance or treatment that appears identical to the actual treatment but lacks the active substance
placebo
The method used to assign participants to different research conditions so that all participants have the same chance of being in any specific group
random
A group of research participants who are treated exactly the same way as the experimental group, except that they do not receive the independent variable or treatment.
control
A study ub which neither the participants nor the researchers administering the treatment know who has been assigned to the experimental or control group
double-blind
An explanation of the purposes of the study following data collection
debriefing
The score that separates the lower half of the scores from the upper half
median
(2 words) A statistical measure of how much the scores in a sample vary around the mean
standard deviation
The most commonly occurring score or value
mode
A plotted curve that shows a normal distribution of scores
Bell
A statistic that compares two means to see whether they could come from the same population
t-test
The arithmetic average of a series of numbers
mean