The table below describes the smoking habits of a group of asthma sufferers. Occasional smoker Nonsmoker OA. 0.535 OB. 0.595 OC. 0.580 OD. 0.490 381 391 772 31 32 63 Regular smoker Heavy smoker Men 72 Women 66 Total 138 If one of the 1,052 people is randomly selected, find the probability that the person is a man or a heavy smoker. Total 47 32 79 D 531 521 1,052

We are interested in looking at the effect of a baseball player’s free agent status on their salary. We look at 337 baseball players and categorize them as either having a high salary (above 2 million) or not, and as either being free agents or not. ------------------------------------- You also wonder if having a high batting average affects the salary of baseball players. You classify all 370 baseball players as having a high batting average if it is over .300. 1. What are the variables you are looking at? What are the possible categories within each variable? Which is the explanatory, and which is the response? 2. If we want to perform a χ2 test to see if there is a relationship between the two variables, what is our null and alternative hypothesis?

Evaluate.

Simplify. 1. (8-3)(9-7) 2. 7+42 刊 3. -10+7 - 5(-4)