1 ) Describe what is meant by a negative relationship and a positive relationship between two variables.

2 ) A sample of n = 25 pairs of scores (X and Y values) produces a correlation of r = 0.40. Are these sample data sufficient to conclude that there is a significant non-zero correlation between X and Y in the population? Use a two-tailed test at the .05 level of significance.

3. For the data below:

a. Compute the Pearson correlation.

b. Find the regression equation for predicting Y from X.

X Y

5 10

3 6

6 7

4 3

2 4