A researcher wishes to see if there is a difference between the mean number of hours per week that a family with no children participates in recreational activities and a family with children participates in recreational activities at a = 0.01. She selects two random samples and the data are shown. Find the critical values(s). X No children 8.7 1.9 Children 10.5 2.9 0-2.58 0 -2.33 02.33 0 21.65