Question: If there are 4 groups 1,2,3,4 the question is to find if there's difference between mean of group(1,2,3) and a single group (4) in r?

If there are 4 groups 1,2,3,4

the question is to find if there's difference between mean of group(1,2,3) and a single group (4) in r?

So mean of the whole group(1,2,3) compare to mean of group(4)

In this case, should I use ANOVA? or t-test?

Thanks for the advice

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