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Two Tests With Two Morals

These tests are interesting because it illustrates two separate points quite well. First, let's take the tests, then I'll draw the morals for you. I first encountered the scheme used here in Daniel Dennett's book "Darwin's Dangerous Idea" (which I highly recommend), and I present it almost unchanged:

Test Number One

You have a set of cards before you. Each card has a letter on one side, and a number on the other.

    -----  -----  -----  -----
    | D |  | F |  | 3 |  | 7 |
    -----  -----  -----  -----

Now, let's say there's a condition that you're asked to check for. The condition is, "If there's a D on one side of the card, then there's a 3 on the other side." Which of the above cards do you need to flip over to see if that condition is met? Take your time, reason it out.

I won't tell you the answer yet. For now, let's move on to the second test.