Use this scenario to answer questions 35 through 38. A researcher compares mean reaction time (RT) in a group of young adults and a group of elderly adults. Do the younger participants have a faster reaction time (smaller mean RT) than the older participants? Use an independent-samples t-test to test this hypothesis. 20-30 year olds 70-80 year olds n = 22 n = 20 mean = 489 mean = 532 standard deviation = 42 standard deviation = 57 What is your t-statistic? O 1) -1.684 ( 2) - 2.801 3) 19.857 ( 4) 2.125