Exercise

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.

Instructions

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.
  • Hit submit to view the results!