Excercise should be solved using R

The data set juul in the library ISwR contain several variables. Variable igf1 measures insulin-like growth factor and variable testvol the testicular volume of the boys only (of course) of the data set.

Perform the appropriate test to see if there is difference on the insulin-like growth factor when menarche has occurred or not (for girls only of course).

Perform the appropriate test to see if there is difference on the insulin-like growth factor based on gender.

Perform the appropriate test to see if there is difference on the insulin-like growth factor based on the tanner stage of puberty.

Find the appropriate 95% Simultaneous Confidence Intervals.

Perform the appropriate test to see if there is difference on the testicular volume of the boys based on the tanner stage of puberty

. Find the appropriate 95% Simultaneous Confidence Intervals.