STAT 205 Quiz: STAT 205 South Carolina Quiz3 key
Document Summary
The following table cross-classi es 6549 subjects living in massachusetts according to health risk (stressed or not stressed) and income (low, medium, or high): This is turned into a table of probabilities by dividing each cell by the total sample size 6549: 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. = 0. 15 ( rst table) or 0. 15 (second table): (2 points) what is the probability that someone with a low income in this study is stressed, = 0. 21 (second table): (2 points) what is the probability that someone in this study is stressed or has low income, = 0. 45 ( rst table) or 0. 08 + 0. 04 + 0. 04 + 0. 30 (second table). P (s or l) = p (stressed or low income) = p (stressed) + p (low income) p (stressed and low income)
