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Confounding Essay Topics & Paper Examples

Chapter 4 Practice Test

Part I – Multiple Choice 1. Suppose that the scatterplot of (log x, log y) shows a strong positive correlation Which of the following must be true? I. The variables x and y also have a correlation close to 1. II. A scatterplot of (x, y) shows a strong nonlinear pattern. III. The residual plot of the variables x and y shows a random pattern. (a) I only (b) II only (c) III only (d) I and II (e) I, II, and III 2. What is the purpose of residual plots? (a) To determine causation. (b) To assess the type of relationship that exists between x and y. (c) To check the appropriateness and fit of the regression equation for…