Well… as for the example in the book…. I was just thinking that the Hypothesis that could be used is….

Matt and His GPA is better when the amount of rainfall is the most because he studies more because he has to stay indoors…. as opposed to when it’s nice out and he is out playing or doing recreational things… devoting less time to studies…

For prices…. when supply is high and demand is low… gas prices (or just prices of ANYTHING in general) are low… so that people will buy more… When supply is low and demand is high (as in the case of gas prices and milk or eggs), price sky rocket. Before I could get a gallon of milk for $2.50…. Now I pay $4.50…. it has to do with the effects of farming corn.

Anyways, hope this helps since no one else answered… but it’s the first one that popped into my head.