This is statistics for biology majors.

Two independent random samples of men, aged 30 to 39, are recruited to participate in a study of the health effects of smoking. All are current smokers. The frequent smokers (group 1) consume 20 or more cigarettes per day. The occasional smokers (group 2) consume between 1 and 5 cigarettes per day. The following table summarizes the systolic blood pressure measurements of the two groups:

\fF29. 29, 95 = 1.861 29 29, .975 = 2.101 F30. 30. 95 = 1.841 30 30 975 = 2.074 155. 95 = 1.673 55. 975 = 2.004 58. .95 =1.672 58. .975 = 2.002 59 95 = 1.671 59. .975 = 2.001