Introductory Statistics 9th Edition

Published by Wiley
ISBN 10: 1-11905-571-7
ISBN 13: 978-1-11905-571-6

Chapter 4 - Section 4.3 - Marginal Probability, Conditional Probability, and Related Probability Concepts - Exercises - Page 149: 4.35

Answer

a. i. P(likes chocolate ice cream)=$\frac{207}{700}= 0.2957$ ii. P(women) =$ \frac{400}{700}$ = 0.5714 iii.P(likes vanilla ice cream| woman) = $\frac{143}{400}$=0.3575 iv. (man | likes chocolate ice cream) = $\frac{98}{207}$=0.4734 b. Men and vanilla ice cream are non mutually exclusive. c. Not independent

Work Step by Step

b. Men and vanilla ice cream are non mutually exclusive. P(men) ∩ P(vanilla ice cream ) = $\frac{79}{700}$ = 0.1129 Because P(men) ∩ P(vanilla ice cream )$ \ne 0$, thus it is non mutually exclusive. c. P(women)= 0.5714, P(women|chocolate ice cream) = $\frac{109}{207}$ = 0.5265 P(women)$ \ne $P(women|chocolate ice cream), thus they are not independent events.
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