Suppose that some researchers regressed, for graduating high-school seniors, high-school-GPA on tablet-use-in-high-school and found an insignificant estimate

Question:

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?

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