Term
| independent groups design |
|
Definition
| a between subjects design that uses a manipulated independent variable and has at least 2 groups of participants; subjects are randomly assigned to the groups |
|
|
Term
|
Definition
| a between subjects design that uses a manipulated independent variable and has at least 2 groups of participants; subjects are matched on some variable assumed to affect the outcome before being randomly assigned to the groups |
|
|
Term
| nonequivalent groups design |
|
Definition
| a between subjects design with at least 2 groups of participants that uses a subject variable or that creates groups that are nonequivalent |
|
|
Term
|
Definition
| another name for a within subjects design; participants are tested in each of the experimenter's conditions |
|
|
Term
|
Definition
| one of the conditions that should be in effect in order to perform parametric inferential tests such as a t test or ANOVA; refers to the fact that variability among all the conditions of a study ought to be similar |
|
|
Term
| t test for independent samples |
|
Definition
| an inferential statistical analysis used when comparing 2 samples of data in either a an independent groups design or a nonequivalent groups design |
|
|
Term
| t test for related samples |
|
Definition
| an inferential statistical analysis used when comparing 2 samples of data in either a matched groups design or a repeated measures design |
|
|
Term
| single factor multilevel design |
|
Definition
| any design with a single independent variable and more than 2 levels of the independent variable |
|
|
Term
|
Definition
| any outcome that does not form a straight line when graphed; can occur only when the independent variable has more than 2 levels |
|
|
Term
|
Definition
| variable for which an infinite number of values potentially exists |
|
|
Term
|
Definition
| variable in which each level represents a distinct category that is qualitatively different from another category |
|
|
Term
| ANOVA (Analysis of Variance) |
|
Definition
| the most common inferential statistical tool for analyzing the results of experiments when dependent variables are measured on interval or ratio scales |
|
|
Term
|
Definition
| control group in which some participants believe they are receiving the experimental treatment but they are not |
|
|
Term
| waiting list control group |
|
Definition
| control group in which participants aren't yet receiving treatment but will, eventually, used to ensure that those in the experimental and control groups are similar |
|
|
Term
|
Definition
| control group in which the treatment given a member of the control group is matched exactly with the treatment given a member of the experimental group |
|
|
Term
|
Definition
| on bar or line graphs, they indicate the amount of variability around a mean; often reflect standard deviations or confidence intervals |
|
|
