CHAPTER 6 t
Exercise 7 x ,
a. A n B is the event that the individual is exposed to high levels of both carbon monoxide and
b A U B is the event that the 1nd1v1dual is exposed to either carbon monox1de or nitrogen
dioxide or both.
Variable ' Std. Error t p
Baseline cholesterol 12.14 0.000
Body mass index 0.35 0.726
Gender O.68 0.496
Both diet group and baseline cholesterol level have a
eight weeks after the start of the study.
b. If an individu
a. For the chisquare distribution with 2 df, 1.0% of the area under the curve lies to the right of
x2 = 9.21.
b. About 2.5% of the area lies 1:
c. The value X2 = 4.61 cuts off
. Exercise 7
a. For the chisquare distribution with 17 df, 1.