Glossary / Lexicon

Experimental method refers to a research method used to uncover cause-and-effect relationships between . . . Read More

Cause-and-effect relationship refers to the result of a well-controlled experiment about which the researcher . . . Read More

Null hypothesis the hypothesis alternative to a primary hypothesis, stating that there is no relationship . . . Read More

Directional hypothesis is defined as a tentative prediction that the levels of an independent variable . . . Read More

- History as a threat to internal validity : History as a threat to internal validity is a change in . . . Read More

Internally valid is a term used in an experiment ; an experiment is considered internally valid to the . . . Read More

Manipulation is defined as the alteration of a variable by an experimenter in expectation that the alteration . . . Read More

Nondirectional hypothesis refers to a tentative prediction that the levels of an independent variable . . . Read More

Time-lag design refers to a quasi-experimental design similar to the cross-sectional design in which . . . Read More

Variable refers to a dimension along which people, things, or events differ; - - In the psychology context, . . . Read More