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Held: Monday, 28 April 2008
Summary: We consider tests that can be used to determine what samples of two populations reveal about the differences of means between those two populations.
the two means are the same.
df = (s1^2/n1 + s2^2/n2)^2/((s1^2/n1)^2/(n1-1) + (s2^2/n2)^2/(n2-1))
t.testto compute a confidence interval.
qt, but, once again, you need to supply the area of the curve to the left of that value. For a 95% confidence interval and 5 degrees of freedom, we would write
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