正在写一篇论文，得出几个数值如下：
Onaverage, book buyers seek product information through 1.7 channels (=451/267for internet buyers and 375/223 for store buyers). The average number ofchannels for clothing is 1.6 (=382/235) for internet buyers and 1.5 (=347/236)for store buyers.   



请问如何检验1.7 vs. 1.6, 1.7 vs. 1.5, 1.6 vs.1.5是否存在显著性差异呢？