Making Box Plots - Launch (slide 2) in Box Plots lesson 2

[retabak]

• Add dot plots to pyret library #2205 dependent

Instead of just telling students, they could observe multiple graphs that all have the same center, but different spreads. (This could be used as a way to reinforce sample size, the graphs could be from the same population but different samples of size 10, 20, and 100).

[retabak]

I've created 3 datasets of different sizes from the same sample that show a similar center but different spread: https://code.pyret.org/editor#share=1SGCxLb1L7DOyuQ3HhE82HbJlPOgCgUfG&v=dc8be4e

I'm not updating the lesson yet, because I think it would make the most sense to present this data as DOT PLOTS. So, changing the deadline; need ability to build dot plots in pyret to complete this task.

fyi @flannery-denny