Suppose that some researchers regressed, for graduating high-school seniors, “high-school-GPA” on “tablet-use-in-high-school” and found an insignificant estimate on “tablet-use.” What are three...

Suppose that some researchers regressed, for graduating high-school seniors, “high-school-GPA” on “tablet-use-in-high-school” and found an insignificant estimate on “tablet-use.” What are three reasons why “tablet-use” may indeed affect GPA, despite the finding of this research?