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Unformatted text preview: conclusion that playing violent video games is associated with poor academic performance and bad behavior, but we cannot say that violent video games leads to these things happening. 3a) mean(x) = 23.83 mean(y) = 255.66 sd(x) = 14.22 sd(y) = 165.48 sumxy = 48410, r = .839 m = (165.48/14.22)*.839 = 9.77 b = 255.66 - 23.83*9.77 = 22.81 Pred Y = 9.77(x) + 22.81 3b) Pred Y = 9.77(22)+22.81 = 237.75 or approx 238. 3c)Doesnt make sense. Correlation does not imply causation, basically same as 2b). (Note that this is not ecological correlation since were not calculating averages or medians, what were interested in is actually data for cities.) Size of the city is a likely confounding factor. Bigger cities in general have more Burger King restaurants and homicides than smaller cities....
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This note was uploaded on 02/08/2011 for the course STAT 21 taught by Professor Anderes during the Fall '08 term at University of California, Berkeley.
- Fall '08