3、选择SPSS中compare means菜单， 独立样本， t-test。选择双侧检验，以及统计显著性水平α=0.05 运行
Fisher Box, Joan. Guinness, Gosset, Fisher, and Small Samples. Statistical Science. 1987, 2 (1): 45–52.
OConnor, John J.; Robertson, Edmund F., Gosset, MacTutor History of Mathematics archive