Chapter 3.11, Problem 63SE

The correlations computed for the six variables in the epilepsy study are given here. Do the sizes of the correlation coefficients reflect the relationships displayed in the graphs given in Exercise 3.62? Explain your answer.

3.62.

Refer to the epilepsy study data in Table 3.19. Examine the scatterplots of Y₁, Y₂, Y₃, and Y₄ versus baseline count and age given here.

1. a. Does there appear to be a difference in the relationship between the seizure count (Y₁ − Y₄) and either the baseline count or age when considering the two groups (treatment and placebo)?
2. b. Describe the type of apparent differences, if any, that you found in part (a).

Seizure counts versus age and baseline counts