Describe how the goal of an experimental research study is different from the goal for nonexperimental or correlational research. Identify the two elements that are necessary for an experiment to achieve its goal.The goal of an experimental research study is which of the following?

a.To make an observation to determine the correlation between two variables

b.To demonstrate the existence of a cause-and-effect relationship between two variables

c.To make an observation without manipulating any variables

d.To make an observation to determine the relationship among several variables

To accomplish the goal, an experiment must do which of the following? Check all that apply.

a.Control extraneous variables

b.Manipulate several variables

c.Manipulate an independent variable

d.Control an independent variable

The goal of experimental research study is different from the goal of non experimental research. The experiment attempts to show the change in one variable due to change in another variable. To accomplish this goal the an experiment control extraneous variables and manipulate independent variables. The experiment is done by changing one variable by manipulating which causes change in another variable. The researcher must control the research situation.