Question: In R 1) Using mtcars data set and tapply function, please find the average disp by cyl and am. 2) For the data set rat

In R

1) Using mtcars data set and tapply function, please find the average disp by cyl and am.

2) For the data set rat from "UsingR", do a one sample t-test for mean against 112 using p value based on R outputs. Please replicate the p value from R outputs?

(Please show code)

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