[R] Does the t.test in R uses Welch procedure or ordinary student t-test?

From: Kes Knave <kestrel78_at_gmail.com>
Date: Thu, 14 Feb 2008 11:51:55 +0100

Dear all

I have run t.test(), and get a output similar to this:

t.test(extra ~ group, data = sleep)

        Welch Two Sample t-test

data: extra by group
t = -1.8608, df = 17.776, p-value = 0.0794 alternative hypothesis: true difference in means is not equal to 0 95 percent confidence interval:
-3.3654832 0.2054832
sample estimates:
mean in group 1 mean in group 2

           0.75 2.33

Should this be refered as a Welch procedure or ordinary student t-test?

Regards Kes

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