Distinguish between the following:
-Internal validity and external validity .
-Pre-experimental design and quasi-experimental design .
-History and maturation .
-Random sampling, randomization, and matching .
-Environmental variables and extraneous variables
Internal validity basically has to do with the the degree of accuracy that the results of a given experiment or recent study have. This accuracy can be strengthened or weakened by the procedures that take place during the compilation of data, or how the sampling pool is selected. External validity on the other hand, is how effective the results of a given experiment or research study can be used to generalize a total population. If the sampling pool from within a general population is very narrow in ...