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Which function in R language is used to find out whether the means of 2 groups are equal to each other or not?

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Which function in R language is used to find out whether the means of 2 groups are equal to each other or not?

(a) f.tests ()

(b) l.tests ()

(c) t.tests ()

(d) not exist

I have been asked this question in final exam.

This interesting question is from Functions topic in portion Control Structures, Functions, Scoping Rules, Loop Functions and Debugging of R Programming

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The correct choice is (c) t.tests ()

To explain I would say: t.tests () function in R language is used to find out whether the means of 2 groups are equal to each other. It is not used most commonly in R. It is used in some specific conditions.

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