为什么这样的数据t检验后p值会很小的？

<br />
a <- matrix(c(0.57002,1        ,<br />
            40.56,1          ,<br />
            7.8499,1         ,<br />
            -36.91,1         ,<br />
            -45.15,1         ,<br />
            6.2401,1         ,<br />
            4.79,1           ,<br />
            1.0899,1         ,<br />
            -9.44,1          ,<br />
            6.54,1           ,<br />
            -0.89008,1       ,<br />
            -0.40994,1       ,<br />
            51.63,1          ,<br />
            -27.76,1         ,<br />
            4.03,1           ,<br />
            -31.86,1         ,<br />
            13.14,1          ,<br />
            14.37,1          ,<br />
            0.029999,1       ,<br />
            -5.54,1          ,<br />
            0.029953,1       ,<br />
            -7.6901,1        ,<br />
            5.4001,1         ,<br />
            10.49,1          ,<br />
            -8.04,1          ,<br />
            -4.51,1          ,<br />
            13.97,1          ,<br />
            12.53,1          ,<br />
            5.22,1           ,<br />
            55.93,1          ,<br />
            -11.22,1         ,<br />
            14.22,1          ,<br />
            5.64,1           ,<br />
            -19.3,1          ,<br />
            -32.31,1         ,<br />
            2.6,1            ,<br />
            7.29,1           ,<br />
            7.4401,1         ,<br />
            -18.49,1         ,<br />
            13.94,1          ,<br />
            4.04,1           ,<br />
            52.62,1          ,<br />
            -9.86,1          ,<br />
            31.46,1          ,<br />
            3.2099,1         ,<br />
            3.73,1           ,<br />
            -3.4,1           ,<br />
            8.76,1           ,<br />
            -13.23,1         ,<br />
            -3.0899,1        ,<br />
            -4.9599,1        ,<br />
            -18.34,1         ,<br />
            -9.77,1          ,<br />
            -4.6801,1        ,<br />
            6.1901,1         ,<br />
            0.63007,1        ,<br />
            19.79,1          ,<br />
            11.74,1          ,<br />
            19.33,1          ,<br />
            19.15,1          ,<br />
            -18.1,1          ,<br />
            9.98,1           ,<br />
            -12.29,1         ,<br />
            -0.25995,1       ,<br />
            -9.1901,1        ,<br />
            11.15,1          ,<br />
            -34.51,1         ,<br />
            -11.59,1         ,<br />
            -27.59,1         ,<br />
            4.01,1           ,<br />
            -6.3199,1        ,<br />
            1.3699,1         ,<br />
            -0.26001,1       ,<br />
            -15.23,1         ,<br />
            -0.019989,1      ,<br />
            26.03,1          ,<br />
            17.03,1          ,<br />
            -5.53,1          ,<br />
            0.52005,1        ,<br />
            4.7,1            ,<br />
            -7.88,1          ,<br />
            8.24,1           ,<br />
            -4.9299,1        ,<br />
            -2.07,1          ,<br />
            40.99,1          ,<br />
            21.11,1          ,<br />
            -1.5099,1        ,<br />
            -17.84,1         ,<br />
            -9.6501,1        ,<br />
            -4.89,1          ,<br />
            41.97,1          ,<br />
            -24.97,1         ,<br />
            -47.3,1          ,<br />
            -0.93008,1       ,<br />
            -24.87,1         ,<br />
            -2.3601,1        ,<br />
            -8.4401,1        ,<br />
            -14.77,0         ,<br />
            -17.44,0         ,<br />
            -7.21,0          ,<br />
            -2.88,0          ,<br />
            -22.5,0          ,<br />
            2.52,0           ,<br />
            1.7501,0         ,<br />
            -31.26,0         ,<br />
            -7.35,0          ,<br />
            -1.01,0          ,<br />
            -52.98,0         ,<br />
            8.76,0           ,<br />
            25.49,0          ,<br />
            3.17,0           ,<br />
            -11.82,0         ,<br />
            -14.19,0         ,<br />
            -11.5,0          ,<br />
            -36.15,0         ,<br />
            52.53,0          ,<br />
            -6.1801,0        ,<br />
            -42.32,0         ,<br />
            -31.83,0         ,<br />
            12.57,0          ,<br />
            -3.6499,0        ,<br />
            -0.14996,0       ,<br />
            -5.89,0          ,<br />
            -2.4001,0        ,<br />
            -3.62,0          ,<br />
            -4.38,0          ,<br />
            -23.12,0         ,<br />
            -11.56,0         ,<br />
            -19.25,0         ,<br />
            47.1,0           ,<br />
            -20.03,0         ,<br />
            3.25,0           ,<br />
            3.9301,0         ,<br />
            -10.02,0         ,<br />
            -3.0299,0        ,<br />
            -0.91005,0       ,<br />
            -13.14,0         ,<br />
            22.4,0           ,<br />
            -42.83,0         ,<br />
            -16.93,0         ,<br />
            -13.3,0          ,<br />
            -46.04,0         ,<br />
            -18.76,0         ,<br />
            -10.35,0         ,<br />
            -4.57,0          ,<br />
            -4,0             ,<br />
            30.42,0          ,<br />
            14.13,0          ,<br />
            -45.71,0         ,<br />
            -1.24,0          ,<br />
            -5.71,0          ,<br />
            -43.42,0         ,<br />
            19.02,0          ,<br />
            -17.34,0         ,<br />
            1.7801,0         ,<br />
            -4.67,0          ,<br />
            -10.11,0         ,<br />
            -14.48,0         ,<br />
            2.9,0            ,<br />
            -15.15,0         ,<br />
            42.03,0          ,<br />
            7.31,0           ,<br />
            -2.3499,0        ,<br />
            -7.08,0          ,<br />
            10.08,0          ,<br />
            11.01,0          ,<br />
            1.76,0           ,<br />
            0.9899,0         ,<br />
            -8.89,0          ,<br />
            5.38,0           ,<br />
            -23.42,0         ,<br />
            -4.12,0          ,<br />
            -36.98,0         ,<br />
            -4.99,0          ,<br />
            -4.9501,0        ,<br />
            -3.8399,0        ,<br />
            -17.52,0         ,<br />
            -7.35,0          ,<br />
            -1.04,0          ,<br />
            -12.09,0         ,<br />
            -23.92,0         ,<br />
            6.8499,0         ,<br />
            -3.97,0          ,<br />
            42.43,0          ,<br />
            -20.52,0         ,<br />
            -14.3,0          ,<br />
            -15.94,0         ,<br />
            -0.95001,0       ,<br />
            -37.38,0         ,<br />
            -14.36,0         ,<br />
            14.97,0          ,<br />
            -6.23,0          ,<br />
            39.93,0          ,<br />
            -65.34,0         ,<br />
            -27.15,0         ,<br />
            -4,0             ,<br />
            -10.05,0         ,<br />
            26.67,0          ,<br />
            -9.9199,0        ,<br />
            12.66,0          ,<br />
            19.83,0          ,<br />
            -44.88,0         ,<br />
            3.2799,0         ,<br />
            -10.04,0         ,<br />
            -30.55,0         ,<br />
            -13.25,0         ,<br />
            -8,0             ,<br />
            -3.4199,0        ,<br />
            -6.8201,0        ,<br />
            4.8102,0         ,<br />
            -8.9901,0        ,<br />
            -21.77,0         ,<br />
            -5.92,0          ,<br />
            13.68,0          ,<br />
            11.1,0           ,<br />
            -0.74997,0       ,<br />
            2.49,0           ,<br />
            -4.98,0          ,<br />
            -3.2399,0        ,<br />
            -24.91,0         ,<br />
            12.24,0          ,<br />
            11.01,0          ,<br />
            10.66,0          ,<br />
            -1.11,0          ,<br />
            -67.97,0         ,<br />
            -9.48,0          ,<br />
            11.76,0          ,<br />
            34.64,0          ,<br />
            0.55008,0        ,<br />
            -5.89,0          ,<br />
            -10.19,0         ,<br />
            -11.82,0         ,<br />
            -4.97,0          ,<br />
            -4.6501,0        ,<br />
            12.61,0          ,<br />
            -10.48,0         ,<br />
            7.4499,0         ,<br />
            -16.77,0         ,<br />
            -0.75005,0       ,<br />
            10.02,0          ,<br />
            -7.41,0          ,<br />
            -16.11,0         ,<br />
            -21.22,0         ,<br />
            -12.08,0         ,<br />
            -8.1,0           ,<br />
            -22.82,0         ,<br />
            32.078,0         ,<br />
            2.17,0           ,<br />
            -13.95,0         ,<br />
            2.02,0           ,<br />
            -7.1201,0        ,<br />
            -73.18,0         ,<br />
            -12.8,0          ,<br />
            -3.09,0          ,<br />
            8.7801,0         ,<br />
            30.21,0          ,<br />
            -24.06,0         ,<br />
            -48.98,0         ,<br />
            0.82004,0        ,<br />
            -15.36,0         ,<br />
            -6.9,0           ,<br />
            -14.56,0         ,<br />
            53.73,0          ,<br />
            -38.96,0         ,<br />
            -7.36,0          ,<br />
            -38.24,0         ,<br />
            -10.7,0          ,<br />
            42.76,0          ,<br />
            -11.51,0         ,<br />
            -1.44,0          ,<br />
            28.67,0          ,<br />
            -10.37,0         ,<br />
            -11.73,0         ,<br />
            -5.9801,0        ,<br />
            -0.67998,0       ,<br />
            2.3499,0         ,<br />
            -24.25,0         ,<br />
            -25.01,0         ,<br />
            6.06,0           ,<br />
            0.51004,0        ,<br />
            4.74,0           ,<br />
            -2.9399,0        ,<br />
            -28.58,0         ,<br />
            -44.01,0         ,<br />
            -69.09,0         ,<br />
            -3.1,0           ,<br />
            12.81,0          ,<br />
            -10.6,0          ,<br />
            -5.2501,0        ,<br />
            15.41,0          ,<br />
            -61.07,0         ), ncol=2, byrow=TRUE)</p>
<p>x <- a[a[,2]==0, 1]<br />
y <- a[a[,2]==1, 1]<br />
plot(density(x))<br />
lines(density(y))<br />
t.test(x,y)<br />

我试了一下，从图片上看两组的分布是有区别的，均值看上去不一样