Final answer:
A finding that is statistically significant means that chance is NOT a plausible explanation for our finding.
Step-by-step explanation:
In statistics, a finding that is statistically significant means that chance is NOT a plausible explanation for the finding. It does NOT mean that our research hypothesis is necessarily true or that flaws in our research design become less relevant. Therefore, the correct answer is a. Chance is NOT a plausible explanation for our finding.