Use the results of Exercises 1.28 and 1.31 to create a plot that illustrates the interaction evident from the data. Use the plot in Figure 1.3 in Example 1.3 as a guide. Could the type of information found in Exercises 1.28 and 1.31 have been found in an observational study in which there was no control on injection velocity and mold temperature by the analyst? Explain why or why not.

# Use the results of Exercises 1.28 and 1.31 to create a

## Problem 1.32 Chapter 1

Probability and Statistics for Engineering and the Sciences | 9th Edition

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Use the results of Exercises 1.28 and 1.31 to create a