Thanks for these constructive comments, @tomstafford!
1. Sounds like I need to rethink my expectations about increasing statistical power. If you don't think the conclusion I floated follows from the data, I should learn more about such statistical inferences.
2. Regarding how well my assessments measure the skills/knowledge that #argumentMapping:
My assessments are similar to the ones that were used to detect benefits of argument map training in past research:
- tests of critical thinking (e.g., belief bias, identifying and responding to informal fallacies): https://byrdnick.com/archives/12654/evaluate-the-argument-with-one-flowchart
- persuasive/argumentative essays (that, like argument maps, prioritize clarity, cogency, and concision ā in that order): https://byrdnick.com/archives/29297/a-3-paragraph-writing-assignment
I hope to make further improvements to the manuscript before submitting the manuscript for publication. I expect strong pushback from the reviewers who (a) have published the positive results, (b) sell argument mapping software, textbooks, workshops, etc.