Diann wants to see if heat causes happiness. she asks 100 participants to come to the laboratory, and as they walk in, she asks each person to choose a warm booth or a cool booth. on the basis of their choices, participants spend 20 minutes in one or the other booth before rating their levels of general happiness. what's wrong with diann's experiment?

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?