Problem: In sum, the results indicate that quadratic effects among g, aptitude tests, and GPAs are trivial, at least for ability range and tests sampled here (SAT, ACT, PSAT). The results do not support theories of intelligence (threshold theories and SLODR), which predict that test scores lose predictive power above an arbitrary threshold or with increases in ability level. Further research is needed to examine whether such theories may be confirmed with specific cumulative GPAs (e.g., physics), which may require a minimum level of ability to handle the coursework. Does this article support my point? Need Assignment Help?