Twenty college students experience the effects of alcohol on reaction time. They perform very basic timed responses in a driving simulator both before and after consuming several alcoholic beverages. The researcher collects a reaction-time result for each of the 20 students before and after intoxication, for a total of 40 measures. What is the 2-tailed null hypothesis for this paired-samples study? There is a mean difference in reaction time before and after consuming alcohol. Reaction time slows with alcohol consumption. There is no mean difference in reaction time before and after consuming alcohol. Reaction time quickens with alcohol consumption.