Define these key terms

1. Independent variable: Variable that is independent of all others in study

2. Dependent variable: Variable that is affected by IV(s)

3. Effect size: Strength of relationship between variables

Fill in the gaps

1. The horizontal axis of a graph is called the x-axis.

2. The vertical axis of a graph is called the y-axis.

3. A natural effect size is measured using the same scale as the dependent variable.

4. The range of possible values for r is –1 to 0 to +1.