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  \code{\link{prop.test}}
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  \code{\link{prop.test}}
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}
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}
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\examples{
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\examples{
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require(graphics)
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require(graphics)
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t.test(1:10,y=c(7:20))      # P = .00001855
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t.test(1:10, y = c(7:20))      # P = .00001855
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t.test(1:10,y=c(7:20, 200)) # P = .1245    -- NOT significant anymore
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t.test(1:10, y = c(7:20, 200)) # P = .1245    -- NOT significant anymore
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## Classical example: Student's sleep data
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## Classical example: Student's sleep data
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plot(extra ~ group, data = sleep)
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plot(extra ~ group, data = sleep)
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## Traditional interface
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## Traditional interface
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with(sleep, t.test(extra[group == 1], extra[group == 2]))
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with(sleep, t.test(extra[group == 1], extra[group == 2]))