T.test

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