Statistics for the Life Sciences (5th Edition)

Published by Pearson
ISBN 10: 0-32198-958-9
ISBN 13: 978-0-32198-958-1

Chapter 3 - Probability and the Binomial Distribution - Exercises 3.3.1 - 3.3.5: 3.3.1


Probability of an Event: P(event) = number of outcomes in event / total number of outcomes Conditional Probability: P(A | B) = P(A & B) / P(B)

Work Step by Step

a.) P(smokes) = 1,213 / 6,549 = 0.1852 b.) P(smokes | high income) = 247 / 2,115 = 0.1168 c.) No, the probability of a person being a smoker depends on whether or not the person has a high income, because the answers to (a) and (b) differ.
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