(a) Estimate whether the following pairs of scores for X and Y reflect a positive relationship, a negative relationship, or no relationship. Hint: Note any tendency for pairs of X and Y scores to occupy similar or dissimilar relative locations.
X Y
64..... 66
40..... 79
30..... 98
71..... 65
55..... 76
31..... 83
61..... 68
42..... 80
57..... 72
(b) Construct a scatterplot for X and Y. Verify that the scatterplot does not describe a pronounced curvilinear trend.
(c) Calculate r using the computation formula.