- Mortality as a threat to internal validity : Mortality as a threat to internal validity refers to a difference in the dependent variable due to differential participant attrition from groups exposed to different levels of the independent variable.

Related Articles

Null hypothesis at psychology-glossary.com■■■
Null hypothesis the hypothesis alternative to a primary hypothesis, stating that there is no relationship . . . Read More
Internal validity at psychology-glossary.com■■■
Internal validity refers to the certainty that experimental interventions did indeed cause the changes . . . Read More
Nonresponse bias at psychology-glossary.com■■■
Nonresponse bias is the distortion of survey results due to the differential rate of responding by various . . . Read More
Nonexperiment control group at psychology-glossary.com■■■
Nonexperiment control group refers to a group of participants used to assess the demand characteristics . . . Read More
Partial counterbalancing at psychology-glossary.com■■■
Partial counterbalancing is a way of ordering the presentation of levels of the independent variable . . . Read More
One-group pretest-posttest design at psychology-glossary.com■■■
One-group pretest-posttest design refers to a non-experimental design in which a single group is tested, . . . Read More
Null results at psychology-glossary.com■■
. . . Read More
Just noticeable difference (JND) at psychology-glossary.com■■
Just noticeable difference (JND) refers to the sensation that results if a change in stimulus intensity . . . Read More
Novelty effect at psychology-glossary.com■■
Novelty effect refers to a threat to external validity that occurs when individuals participating in . . . Read More
Multiple-baseline design at psychology-glossary.com■■
Multiple-baseline design refers to a type of single-subject design that begins with two (2) simultaneous . . . Read More