DSCI 2710(chapter 5)

# DSCI 2710(chapter 5) - Chapter 5 Contingency Table FR SO JR...

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Chapter 5 Contingency Table FR SO JR SR M xxxx F Different kinds of probabilities • marginal – P(F), P(JR), . .. • joint – P(F and SR), . .. • OR’s – P(F or SR), . .. • conditional – P(SR | F),. .. • complement – ,... PSR () Important terms: 1) independent ³ events that don’t affect each other 2) mutually exclusive ³ events that cannot both occur Two Rules 1) P(A or B) = P(A) + P(B) provided A and B are mutually exclusive 2) P(A and B) = P(A) · P(B) provided A and B are independent NOTE : Both rules apply to two or more events Sections 5.3 and 5.4 - Word problems Put these into a 2 x 2 contingency table A A Total B1 21 8 3 0 B 86 2 7 0 Total 20 80 100 You are always given three pieces of information, such as: P(A) = .2, P(B) = .3, and P(B|A) = .6 ³ This leads to the values in the above table. NOTE : Sometimes the third piece of information is P(A and B).

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Chapter 6 Section 6.1 What is a discrete random variable? X = (counting something) Representing a discrete random variable 1. Make a list 0 with probability ___ 1 with probability ___ X = 2 with probability ___ · ·
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DSCI 2710(chapter 5) - Chapter 5 Contingency Table FR SO JR...

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