Statistics: Informed Decisions Using Data (4th Edition)

Published by Pearson
ISBN 10: 0321757270
ISBN 13: 978-0-32175-727-2

Chapter 5 - Section 5.4 - Assess Your Understanding - Applying the Concepts - Page 295: 43

Answer

The events "female" and "driver" are not independent because $P(female~|~driver)\ne P(driver)$

Work Step by Step

The sample space: 57,545 traffic fatalities. So, $N(S)=57,545$ According to the marginal distribution (see page 235) of the second column: $N(female)=18,219$ Using the Empirical Approach (page 258): $P(female)=\frac{N(female)}{N(S)}=\frac{18,219}{57,545}\approx0.3166$ According to the marginal distribution (see page 235) of the first row: $N(driver)=44,729$ According to the cell in the first row, second column: $N(female~and~driver)=11,856$ $P(female~|~driver)=\frac{N(female~and~driver)}{N(driver)}=\frac{11,856}{44,729}\approx0.2651$ $P(female~|~driver)\ne P(driver)$ The events "female" and "driver" are not independent (see definition on page 292).
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