怎样判断调节效应是否存在？譬如，我的调节效应分析结果如下：

                                                                                         Y

                                          R         R方        调整后R方          delta R方         beta

                           X         0.618     0.382           0.374                 0.382            0.332

                           M        0.624     0.389           0.372                 0.007           -0.058

                         X*M       0.625     0.390           0.364                 0.001            0.033