(A) In a population of 158 people: 85 men and 73 women, it was found that 60 men and 46 women had health insurance, the rest no. 40 of the men with health insurance and 9 of the men without insurance, visited the MD office more than 5 times last year. In the other hand, 35 of the women with insurance and 8 of the women without insurance, visited the MD office more than 5 times last year. Giving this information, construct a probability tree and ask yourself 2 questions about the distribution of this population. These two questions are your choice, look at your tree and see which information is interesting to you. The task is to demonstrate that you can build probability trees and to show how they can be used to answer practical questions.

(B) Now imagine you survey 94 young people under 15 and ask the same questions about health insurance and number of visits to the MD office. Imagine the answer you can get, you add the numbers: how many boys and girls, how many boys with and without insurance, how many girls with and without insurance, of those groups how many visited the MD office more or less than 5 times last year. Again, you put those numbers (use your imagination). Then create probability tree with this information and with the men and women information and ask yourself 2 questions about the data that seems interesting to you. Remember that probability trees must contain branches for all the groups, and each level add to 100% of its previous branch.