Passage Summary: Two studies disagree on whether people are working more or less. The author thinks we can stop wondering why they disagree simply because they used different research methods.

Conclusion: There is no need to investigate further to explain why two studies on workweek length produced opposite results.

Reasoning: The two studies used different methodologies to conduct their investigations.

Analysis: The author makes a massive leap by assuming that 'different methods' is a complete and final explanation for 'contradictory results.' In the world of research, just because you used different tools doesn't mean you should get opposite answers; if both methods were valid, they should generally point toward the same truth. The flaw here is the failure to consider that one or both methods might be flawed, or that the difference in methods doesn't actually justify the discrepancy. Look for an answer that points out the author treats a possible explanation as a certain and sufficient one.