12-11. The following are yields (in bushels/acre) for two different varieties of winter wheat (call them A and B):

A: 62.7, 71.4, 76.7, 59.3, 59.7, 64.7, 69.1, 70.5 B: 69.8, 61.5, 49.9, 53.8, 65.1, 66.7, 47.8, 51.1 Can we conclude at the 5% level that the average yields are equal?