quiz4Sp2011_key

# quiz4Sp2011_key - NAME: KEY Stat 205 Quiz 4 The following...

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Unformatted text preview: NAME: KEY Stat 205 Quiz 4 The following table cross-classifies 6549 subjects living in Massachusetts according to health risk (stressed or not stressed) and income (low, medium, or high): Income Stress level Low Medium High Total Stressed 526 274 216 1016 Not Stressed 1954 1680 1899 5533 Total 2480 1954 2115 6549 This is turned into a table of probabilities by dividing each cell by the total sample size 6549: Income Stress level Low Medium High Total Stressed 0.08 0.04 0.03 0.15 Not Stressed 0.30 0.26 0.29 0.85 Total 0.38 0.30 0.32 1.00 Let S be the event that a randomly selected individual is stressed and let L be the event that a randomly selected individual has low income. Use the table to answer the following questions. 1. What is the probability that someone in this study is stressed, Pr { S } ? Answer: 1016 6549 = 0 . 15 (first table) or . 15 (second table) . 2. What is the probability that someone is stressed and has low income, Pr { S and L } ?...
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## This note was uploaded on 12/14/2011 for the course STAT 205 taught by Professor Hendrix during the Fall '09 term at South Carolina.

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quiz4Sp2011_key - NAME: KEY Stat 205 Quiz 4 The following...

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