I don't understand why is it that we assume they come from different geographical regions. Can't it be the case that all the subjects come from California and overestimated? Then the hypothesis that there are some parts of the nation that have lots of cars can still hold through because some is 1 or greater than 1.

Members of the club can now receive a special discount, does this not mean that if you're a member of the club you get a special discount? Why is he saying that's not the case?

For Priscilla's argument what do they mean by radically different ones in answer choice e