Sounds like you did a two-tailed test. shminux's hypothesis, which he has stated several times IIRC, is that people who can solve it will not be taken in by Eliezer's MWI flim-flam, as it were, and would be less likely to accept MWI. So you should've been running a one-tailed t-test to reject the hypothesis that the can-solvers are less MWI'd. The p-value would then be something like 0.13 by symmetry.

No, the data showed people who could solve the Schrodinger Equation being more likely to accept MWI, contrary to shminux's hypothesis, so the p-value would be 0.13 in a one-tailed test for the opposite of shminux's hypothesis. I guess that means the p-value for a one-tailed test for shminux's hypothesis would be 0.87.