Omega-3 revisited Exercises 21 describes an experiment investigating a dietary approach to treating bipolar disorder. Researchers randomly assigned 30 subjects to two treatment groups, one group taking a high dose of omega-3 fats and the other a placebo. a) Why was it important to randomize in assigning the subjects to the two groups? b) What would be the advantages and disadvantages of using 100 subjects instead of 30?

Continuous Probability Distribution Problems The problems here deal with wait times for a ride at Disneyland, with the average wait time being 107 minutes and the standard deviation of those wait times is 30.4. Given X~N(107,30.4), solve the following problems: • What is the probability of waiting less than 45 minutes P(X<45) Z = (45-107)/30.4 = -2.04 P(Z140) Z = (140-107)/30.4 = 1.09 P(Z>1.09) = 1-P(Z<1.09) = 1-0.8621 = 0.1379 Alternatively, you can look up P(Z