Why do researchers manipulate two independent variables in the same experiment?
a. To examine several causal factors within a single experiment by manipulating two or more independent variable simultaneously. b. The separate influences of each variable on behaviour can then be examined, and researchers also can determine whether particular combinations of variables produce unique effects. 29. What are three major differences between the experimental and descriptive/correlational approaches? a. In an experiment, the researcher manipulates one or more (independent) variables and measures their effect on other (dependent) variables vs. in the descriptive/correlational research, all variables are measured. b. Most experiments take place in the laboratory while the descriptive research takes place more in natural environments. c. In most experiments extraneous factors can be kept constant while in the descriptive/correlational research this is not the case. d. The biggest limitation of description/correlation research is that it is not well suited to examine cause/effe
