1. Interpret the following Pearson correlation coefficients:

a.An r of .23 between the number of hours spent with friends after school and self-reported delinquency.

b.An r of .-78 between hours money spent on welfare and crime rates.

2. When two variables are correlated, does this mean that one causes the other? Explain your answer.

3. If you have a calculated value of r that equals .727 and N=10, are you able to reject a null hypothesis tested at the .01 level of significance? Indicate with specifics as to how you can tell.