A bag contains 5 blue, 6 red, and 9 green marbles. How many marbles must be drawn from the bag without looking to be sure that we have drawn (a) a pair of blue marbles? (b) a pair of marbles of the same color? (c) a pair of marbles of different colors? (d) three marbles of the same color? (e) a blue marble, a red marble, and a green marble?

Two researchers are attempting to create a new psychotherapy protocol that more reduces panic attacks. they believe that they have succeeded and are now in the clinical trial period of their protocol's development. they are working with several cohort groups, some of which have been through the new protocol, while others have done the standard protocol currently recommended. if these researchers are interested in evaluating the difference in the percentage of test subjects who successfully decreased their panic attacks in 2 months on the new protocol versus the percentage of test subjects who successfully decreased their panic attacks in 2 months with the traditional protocol, which of the following statistical tests would be most appropriate? a. analysis of variance (anova) b. correlation c. chi-square test d. paired t-test e. independent t-test