Chapter 4.2, Problem 4.32E

To determine

To explain that the students have reason to be skeptical of the research study’s reported results.

Explanation of Solution

The resulting least squares regression equation for their data is Sleep debt $=2.23+3.17(\text{days)}$ .

The students do not have reason to be skeptical of the research study’s reported results because the least-squares regression line predicts even more than 15 hours of "sleep debt" and so it seems that the researches took into account some margin of error.