10. a correlation coefficient of -0.31 has been found between two variables after examining 51 pairs of observations. What can be concluded?

1. There is a strong positive relationship between the two variables.
2. There is a weak positive relationship between the two variables.
3. There is a strong negative relationship between the two variables.
4. here is a weak negative relationship between the two variables.
5. Nothing to be concluded

12. If we do a regression of a grade versus a study time, what number from the Excel output should we examine to be 95% confident that increased study time resulted in a higher grade?

1. P value
2. Correlation coefficient
3. Standard error
4. Multiple R
5. Significance of F