Provide examples of experimental and nonexperimental research design. Contrast the levels of control applied to each.

The four most commonly used designs for research studies are descriptive, correlational, quasi-experimenal, and experimental."(Grove, Gray & Burns, 2015). Descriptive and correlational designs can be referred to as non-experimental designs because the focus is on examining variables as they naturally occur in environments and not in the implementation of a treatment by the researcher. In experimental design researchers uses random assignment and they manipulate an independent variable around a controlled variable. A true experimental design there must be randomization, a control group and manipulation of a variable when examining the direct cause or predicted...