A marketing class designs two videos advertising an expensive Mercedes sports car. They test the videos by asking fellow students to view both, in random order, and say which makes them more likely to buy the car. Mercedes should be reluctant to agree that the video favored in this study will sell more cars because a) the study used a matched pairs design instead of a completely randomized design. b) this is an observational study, not an experiment. c) results from students may not generalize to the older and richer customers who might buy a Mercedes. d) the study used a completely randomized design instead of a matched pairs design.

2.12 school absences. data collected at elementary schools in dekalb county, ga suggest that each year roughly 25% of students miss exactly one day of school, 15% miss 2 days, and 28% miss 3 or more days due to sickness.61 (a) what is the probability that a student chosen at random doesn’t miss any days of school due to sickness this year? (b) what is the probability that a student chosen at random misses no more than one day? (c) what is the probability that a student chosen at random misses at least one day? (d) if a parent has two kids at a dekalb county elementary school, what is the probability that neither kid will miss any school? note any assumption you must make to answer this question. (e) if a parent has two kids at a dekalb county elementary school, what is the probability that both kids will miss some school, i.e. at least one day? note any assumption you make.