4. Consider the following Pearson correlation coefficients: r = 0.5, r = 0.3, r = -0.4, and r = -0.9. Which of these r values represents the strongest 3 relationship between x and y? Explain. 5. There are three criteria that must be met to draw a causal inference: covariance, temporal precedence, and internal validity (also called the third- variable criterion or elimination of alternative explanations). Only one of these criteria can be met by all correlational research. Which one? Explain.