A research technique in which the researcher simply observes and describes behavior
A research technique in which the researcher determines whether variables are related without manipulating the variables
A variable under the control of the experimenter that may effect the dependent variable in a reliable fashion.
The variable being examined by the researcher. It may or may not be effected by the IV
Between Subjects Design
An experimental design in which each subjects is randomly assigned to only one of the treatment conditions
Within Subjects Design
An experimental design where all subjects receive all treatment conditions. Also called a repeated measures design
Type I Error
An error of statistical inference when the null hypothesis is rejected when it is true. This is an error of "seeing too much in the data."
Type II Error
An error of statistical inference when the null hypothesis is retained when it is false. This is an error of "not seeing enough in the data."
Variables not under the control of the experimenter that vary systematically with the independent variable
A research design with more than one IV in which every IV level is present at all levels of the other IVs
any variable other than the IV that affects the DV
Floor and Ceiling Effects
Floor - The values of the DV are so low they are not affected by the IV
Ceiling - The values of the DV are so high they are not affected by the IV
The effect of the change in level of one factor in a factorial experiment measured independently of other variables.
Response Acquiescence effect
The tendency of an interviewee to agree with the questioner.
Random & Fixed Factors
Random - An IV whose levels were chosen randomly from a population of possible values
Fixed - An IV whose levels were chosen non-randomly
Theory - A set of propositions which summarise, organise, and explain a variety of known facts
Hypothesis - A supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.