2.Two group experimental design.
3.Control group design.
8.Single- blind experiment.
13.Experimental development design.
15.Single independent variable.
16. Factorial notation.
17.4, 6, 24
Multiplechoice self test
Control group, experimental group
Using the same subjects in each group, using different subjects in each group.
Regression to the mean increase
Subjects lost differentially from experimental and control group.
Double –blind experiment single -blind experiment.
Regression to the mean
We have at least one significant interaction effect.
An interaction effect
Internal validity refers the degree to which one can infer that a causal relationship exists between two variables where as external validity refers to theThe extent to which the study results can be generalized to and across populations of persons, settings, times, outcomes, and treatment variations. Both of them are vital as they infer the relationship between the two variables.
SherriL. J. (2010). Researchmethods A modular approach,Third Edition.