random sample 100 students 40 changed minds 0.05 significance what is p value?

Answer 1

While you don't give a lot of background information, most likely this is a one-proportion z-test, and most likely you're assuming that in a random sample, 50 out of 100 would change their minds.

I put those numbers into the statistical tests menu on a TI-83 graphing calculator and came up with p = .02275