Explain at least four different ways to improve generalizability in experimental research.

What will be an ideal response?

Sample generalizability--in field experiments, participants can be selected randomly from the population and then results can be more generalizable to the population. Also, when random selection is not feasible, the researchers may be able to increase generalizability by selecting several different experimental sites that offer marked contrasts on key variables; factorial surveys embed the features of true experiments into a survey design to maximize generalizability; Solomon four-group design--a type of experimental design that combines a randomized pretest–posttest control group design with a randomized posttest-only design, resulting in two experimental groups and two comparison groups; replications of studies with different groups can provide a very solid basis for generalization.