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