Two-sample test of proportion                      x: Number of obs =      339
                                                   y: Number of obs =      205
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    Variable |       Mean   Std. Err.      z    P>|z|     [95% Conf. Interval]
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           x |     .02654   .0087299                      .0094297    .0436503
           y |     .02439   .0107738                      .0032738    .0455062
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        diff |     .00215   .0138667                     -.0250282    .0293282
             |  under Ho:   .0140081     0.15   0.878
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        diff = prop(x) - prop(y)                                  z =   0.1535
    Ho: diff = 0

    Ha: diff < 0                 Ha: diff != 0                 Ha: diff > 0
 Pr(Z < z) = 0.5610         Pr(|Z| < |z|) = 0.8780          Pr(Z > z) = 0.4390

请问如何解释测试结果,两个样本之间有差异吗?