Foot ulcers are a common problem for people with diabetes. Higher skin temperatures on the foot indicate an increased risk of ulcers. In a study carried out at the Colorado School of Mines, skin temperatures on both feet were measured, in degrees Fahrenheit, for 18 diabetic patients. The results are presented in the following table.

a. Compute the least-squares regression line for predicting the right foot temperature from the left foot temperature.

b. Construct a scatterplot of the right foot temperature (y)
versus the left foot temperature (x). Graph the least-squares regression line on the same axes.

c. If the left foot temperatures of two patients differ by 2 degrees, by how much would you predict their right foot temperatures to differ?

d. Predict the right foot temperature for a patient whose left foot temperature is 81 degrees.

Transcribed Image Text:

Left Foot Right Foot Left Foot Right Foot 80 80 76 81 85 85 89 86 75 80 87 82 88 86 78 78 89 87 80 81 87 82 87 82 78 78 86 85 88 89 76 80 89 90 88 89