6. Which of the following correlation coefficients shows the strongest relationship between two variables: a 00 b. +.45 -.60 +1.5 7. According to Epstein (1983) and others, the use of aggregation of behaviors across situations or across time: a. improves reliability, resulting in poorer prediction b. decreases reliability, resulting in poorer prediction C. improves reliability, resulting in better prediction d. has no effect on reliability or prediction A correlation of .4 explains what percentage of variability between two variables (that is, what percentage is common or explained variance)? a. 16% b. 40% C. 60% d. Cannot be determined