Which of the following is NOT one the three sources of difficulty in solving insight problems according to Kershaw and Ohlsson?

You have designed an experiment to test a new drug

You prepare the injection doses of the drug and a placebo and label them with different alphabet letters. Then, you hire research assistants to give the injections and to collect data from the participants. These research assistants as well as the participants will not know which injection is the drug or which is the placebo or whether a participant is in the experimental or the control group. You have a. created a placebo effect. b. designed a single-blind experiment. c. designed a double-blind experiment. d. created a self-fulfilling prophecy.

If Julie is in a happy mood, you would predict that she would be:

a. less likely to stereotype. b. more likely to stereotype. c. more likely to favor the outgroup. d. more likely to favor the outgroup and less likely to stereotype.