Dream experiment in psychology. A clinical psychologist is given tapes of 20 subjects discussing their recent dreams.

The psychologist is told that 10 are high-anxiety individuals and 10 are low-anxiety individuals. The psychologist’s task is to select the 10 high-anxiety subjects.

a. Count the number of sample points for this experiment.

b. Assuming that the psychologist is guessing, assign probabilities to each of the sample points.

c. Find the probability that the psychologist guesses all classifications correctly.

d. Find the probability that the psychologist guesses at least 9 of the 10 high-anxiety subjects correctly.