1. For a special pre-New Year's Eve show, a radio station personality has invited a small panel of promi- nent local citizens to help demonstrate to listeners the adverse effect of alcohol on reaction time. The reac- tion times (in seconds) before and after consuming four drinks are in data file XR11050. At the 0.005 level, has the program host made his point? Identify and interpret the p-value for the test.

2. A plant manager has collected productivity data for a sample of workers, intending to see whether there is a difference in the number of units they produce on Monday versus Thursday. The results (units produced) are in data file XR11051. Using the 0.01 level of signifi- cance, evaluate the null hypothesis that there is no dif- ference in worker productivity between the two days. Identify and interpret the p-value for the test, then con- struct and interpret the 99% confidence interval for the mean difference in productivity between the days.