Is there a way to build a mean of rows within a data.frame?

I need to run a t-test. I would like to check two different samples (which don't have the same number of participants) on the same question.

R tells me that arguments must have the same length. Can I somehow reduce the larger sample (200 observations) to the number of arguments of the smaller sample (28 observations) without loosing data?

Thanks a lot!



Read more here: https://stackoverflow.com/questions/68474086/is-there-a-way-to-build-a-mean-of-rows-within-a-data-frame

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