Can you state your null hypothesis & alternative hypothesis precisely? Do you really want to have a test for each question or do you want to examine whether the % of correct answers across all respondents & all questions increased in the post survey?
Even though you can code responses as numeric (0 = incorrect, 1 = correct) for pre & post survey, you are really working with a categorical variable at the individual & question level.
You may find that a chi-sq test is more appropriate if examining each question with the cohorts being correct responders & incorrect responders on pre-test.
If you are evaluating the effectiveness of the intervention across all questions, you could measure the difference in pre & post test scores.
Example:
ID Pre-score Post-score Diff
1 75% 85% +10%
2 50% 65% +15%
...
Again, clearly stating your hypothesis would be very helpful
... View more
