1. Harbor College Day and PACE students were stopped and asked their opinion regarding a new proposed way to handle the statistics requirement for the major. Students could either take Introductory and Intermediate Statistics OR volunteer for a new dental procedure at Harbor-UCLA dental school: a very fast root canal done without any anesthetics, which shortens recovery time substantially. Credit for two semesters of statistics would be given to all volunteers. This is how the students responded:

Speedy Root Canal with no anesthesia /Two semesters of statistics /Margin total

Day Students 25 80

Pace 70 25

Margin Total

A. What was the marginal probability of being a day student in this sample?

B. What was the probability that, given you were a PACE student in this

sample, you would prefer to take statistics for two semesters?

C. What was the probability in this sample of being a day student who'd rather have a root canal than take statistics? (Day student AND root canal)

D. What was the probability of being PACE student OR preferring to take statistics