Statistics for the Behavioral Sciences
Third Edition
Learning Objectives
After reading this chapter, you should be able to:
- Identify the direction and strength of a correlation between two factors.
- Compute and interpret the Pearson correlation coefficient and test for significance.
- Compute and interpret the coefficient of determination.
- Define homoscedasticity, linearity, and normality and explain why each assumption is necessary to appropriately interpret a significant correlation coefficient.
- Explain how causality, outliers, and restriction of range can limit the interpretation of a significant correlation coefficient.
- Compute and interpret the Spearman correlation coefficient and test for significance.
- Compute and interpret the point-biserial correlation coefficient and test for significance.
- Compute and interpret the phi correlation coefficient and test for significance.
- Convert the value of r to a t statistic and χ2 statistic.
- Summarize the results of a correlation coefficient in APA format.
- Compute the Pearson, Spearman, point-biserial, and phi correlation coefficients using SPSS.