A characteristic that changes between individuals, such as gender, age, intelligence, weight)
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
A research sample that accuratel reflects the population of people one is studying
A study which does not show causation, but does measure 2 or more variables and their relationship with one another
A research technique for combining all research results on one question and drawing a conclusion
(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
A variable whose influence cannot be separated from the independent variable being manipulated
A substance or treatment that appears identical to the actual treatment but lacks the active substance
The method used to assign participants to different research conditions so that all participants have the same chance of being in any specific group
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.
A study ub which neither the participants nor the researchers administering the treatment know who has been assigned to the experimental or control group
An explanation of the purposes of the study following data collection
The score that separates the lower half of the scores from the upper half
(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
A plotted curve that shows a normal distribution of scores
A statistic that compares two means to see whether they could come from the same population
The arithmetic average of a series of numbers