b) Specify the null and alternate hypotheses that you would use, such that if you reject the null you're concluding Krash Cola does work. c) What's your point estimate of the average difference between the scores people got when they drank Krash Cola beforehand and the scores they got when they had not drank Krash Cola before hand? d) Perform a hypothesis test, for a level of significance = .1. Find and interpret the p- value, and decide whether or not you can reject the null hypothesis