In Problem 6.13, the engineer was also interested in potential fatigue differences resulting from the two types of bottles. As a measure of the amount of effort required, he measured the elevation of the heart rate (pulse) induced by the task. The results follow. Analyze the data and draw conclusions. Analyze the residuals and comment on the model’s adequacy.

Worker Bottle Type 1 2 Glass 39 45 20 13 58 35 16 11 Plastic 44 35 13 10 42 21 16 15