At a local college, data were collected on class rank and whether the student had body art. Body Art Class Rank Body Art No Body Art Total Freshman 40 50 90 Sophomore 34 46 80 Junior 45 65 110 Senior 42 68 110 Total 161 229 390 The chi-square statistic for this table has how many degrees of freedom? a. 2 b. 3 c. 4 d. 5 e. 8 Do doctors in managed care plans give less charity care? Researchers chose 60 communities at random, then chose doctors at random in each community. In all, they interviewed 10,881 doctors. Overall, 77.3% of the doctors said they had given some care free or at reduced rates because of the patient's financial need in the month before the interview. Doctors who received at least 85% of their practice income from managed care plans were significantly less likely than other doctors to provide charity care. This study is a(n) a. randomized comparative experiment. b. experiment, but there is no control group. c. census. d. sample survey. 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 The mean of this Normal distribution is about a. 10. b. 50. c. 60. d. 70.