Fall 2017 Labor Day Student Notes.pptx

# Fall 2017 Labor Day Student Notes.pptx - Probability Tables...

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Probability Tables – Chapter 3 Year in School Freshman Sophomor e Junior Senior Total Employed Yes 16 131 81 18 246 No 12 44 21 6 83 Tota l 28 175 102 24 329 What proportion of my students are upperclassman?

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Probability Table Example Year in School Freshman Sophomor e Junior Senior Total Employed Yes 16 131 81 18 246 No 12 44 21 6 83 Tota l 28 175 102 24 329 Find the probability that a randomly selected student has a job or is a freshman?
Probability Table Example Year in School Freshman Sophomor e Junior Senior Total Employed Yes 16 131 81 18 246 No 12 44 21 6 83 Tota l 28 175 102 24 329 What proportion of my students have a job and are juniors?

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Probability Table Example Year in School Freshman Sophomor e Junior Senior Total Employed Yes 16 131 81 18 246 No 12 44 21 6 83 Tota l 28 175 102 24 329 Given that a student works, what is the probability that they are a senior?
Claim: 30% of all college students have a tattoo We randomly sample five college students to find how many of the five have a tattoo Outcomes possible: TTTTT, TTTTN, TTTNT, ….. NNNNN There are 2 5 = 32 possible outcomes If n = 50 students, there are 2 50 = 1.126x10 15 outcomes Random Variables and Probability Distributions

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