Cook. Peacock just moved into the apartment next to Plum and to welcome her, Plum cooked her dinner. She did not realize this at the time, but the mushrooms she used in making her dinner were poisonous. (So far as this is possible, imagine that she is not culpable or blameworthy for her ignorance. She used a field guide for distinguishing safe from unsafe mushrooms, but it contained a few typos.) Plum has on hand the stuff to give people who eat poisoned mushrooms, but only enough for one person. It just so happens that her other neighbor, Mustard, went out picking mushrooms. He picked poisonous mushrooms for himself and put them into his salad. Now, he and Peacock are equally sick and Plum can help only one.
The story continues.
Suppose Green is also into picking mushrooms but the book he picked up from the bookstore happens to be one that contains none of the errors that Plum’s book contained. Both study their books with equal diligence. Both have equally good memories. Both have exhaustive knowledge of the contents of their books. However, Green will always say truthfully whether a mushroom is poisonous whereas Plum will make the occasional mistake. We ask Green and Plum about a specific mushroom, one that we happen to know Green’s book is right about and that Plum’s book is wrong about. When asked, Green and Plum both believe that their answers are correct. However, Green’s belief is true and Plum’s belief is false.
I asked the following question.
(Q1) Should we say that Green’s belief is better justified than Plum’s belief? The results:
Make of it what you will. I'll note that the kids that said 'Yes' had higher grades on the exam.
Just kidding, I don't know if that's true.