An important factor in selling a residential property is the number of people who look through the home. A sample of 20 homes recently sold in the Buffalo, New York, area revealed the mean number looking through each home was 22 and the standard deviation of the sample was 7 people. Develop a 98 percent confidence interval for the population mean.

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