Between Wendy's and McDonald's, which fast-food drive-through window is faster? To answer the question, a random sample of service times for each restaurant was measured. Can we infer from these data that there are differences in service times between the two chains? (Use a = 0.05 for all cases.)

C1 C2 Wendys (x1) Mcdonald (x2) - 133 186 2 144 156 3 155 142 4 149 136 5 143 125 6 153 195 7 114 174 8 140 134 9 161 129 10 158SUM X1