Section 21.1

Exercise Set A: 3, 4, 5

Section 21.2

Exercise Set B: 2, 4

Section 21.3

Exercise Set C: 1, 3, 6, 7

Section 21.4

Exercise Set D: 1, 2

Also: Suppose that in a simple random sample of 1500 adults in the United States, 800 say they support the recent health care reform passed by Congress. Find confidence intervals for the true proportion of adults who support the health care reform at a (a) 95% confidence level, (b) 80% confidence level, and (c) 99% confidence level.

Answers:

(a) (0.5081, 0.5586) (b) (0.5168, 0.5498) (c) (0.5001, 0.5665)