Question

Internal validity of an experiment refers to whether an experiment:

a. has treatments that account for the internal locus of control of participants

b. is valid for the population being studied

c. is influenced by general equilibrium effects

d. can be generalized to an expanded program based on the experiment

e. takes account of the internal workings of the agency conducting the experiment

Answer 1

Takes account of the internal workings of the agency conducting the experiment.

This kind of internal validity will find the trustworthy relation between the cause and effect within the group under study. If the study is internally validated, the researcher can find the alternative explanations. Most of the validity results were based on the observations. Without internal validity, the casual relationship is unidentified. The internal validity shows the strength of the research methods. The internal validity was based on three criteria: cause preceded the effect of the study, cause and effect will change together and no other explanations under the observation. Blinding, experimental manipulations, random selections, study protocol are the major factors which influence the internal validity.