我需要测试才能证明这一点?

And, in a robustness test (with some alternative answers a day later), here are my second results (note that there are no questions about how many parenthetical expressions you use, nor any questions about how many times you take on-line quizzes "测试健壮性"):

Looks more like "书呆子" to me.
[h / t至 菲尔·米勒]