Spurling et al. investigated the effects of two vocabulary learning strategies on word retention two weeks later. In this example, learning strategy is the variable and word retention is the variable. Which correlation coefficient best represents a moderate relationship showing fewer anxiety symptoms in people who report higher life satisfaction.

Independent variable: In research, the term independent variable is the variable that a researcher manipulates, changes. Any changes in the independent variable will lead to create change in the dependent variable.

Dependent variable: In research, the dependent variable is defined as the variable that a researcher tests in an experiment. The independent variable causes a direct effect on the dependent variable.

Correlation coefficient: The term correlation coefficient is defined as a coefficient that signifies the quantitative measure of any dependent and correlation i.e, the statistical relationships that exists between two or more than two observed values of data or random variables.