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In an experiment to study the relationship of hypertension and smoking habits, the following data are collected for 180 individuals:
Moderate
Heavy
Nonsmokers
Smokers
H
21
36
30
NH
48
26
19
where H and NH in the table stand for Hypertension and Nonhypertension, respectively. If one of these individuals is selected at random, find the probability that the person is
(a) experiencing hypertension, given that the person is a heavy smoker;
(b) a nonsmoker, given that the person is experiencing no hypertension.
The 99% confidence interval estimate for a population variance when a sample standard deviation of 12 is obtained from a sample of 10 items is:
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What is the probability of this actually happening?
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