Experimental design is a research design that involves randomly assigning members of a sample to either an experimental group or a comparison group.
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observational study
Observational study is a research design that involves taking a random sample from a population and then measuring some variables; also known as a correlational study.
correlational study
Correlational study is a research design that involves taking a random sample from a population and then measuring some variables; also known as an observational study.
random assignment
Random assignment is a method of assigning subjects to one experimental condition or another; it helps us rule out confounding variables by ensuring that any variables that affect our outcome variable, whether positively or negatively, will balance ...