Parameter estimates of beak depths

Estimate the difference of the mean beak depth of the G. scandens samples from 1975 and 2012 and report a 95% confidence interval.

Since in this exercise you will use the draw_bs_reps() function you wrote in chapter 2, it may be helpful to refer back to it.

100 XP

Compute the difference of the sample means.
Take 10,000 bootstrap replicates of the mean for the 1975 beak depths using your draw_bs_reps() function. Also get 10,000 bootstrap replicates of the mean for the 2012 beak depths.
Subtract the 1975 replicates from the 2012 replicates to get bootstrap replicates of the difference of means.
Use the replicates to compute the 95% confidence interval.
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