Recall the chapter example which described the fact that the mean iq in large, diverse populations is 100 and the standard deviation is 15. your sample of 300 members of your community gave you a mean iq score of 108. calculate the margin of error for the 99% confidence level for this sample. which of the following figures comes closest to your answer?
a. 10.95.
b. ±1.96.
c. 12.23.
d. 11.16.
e. none of the above

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297