该程序可思路：先将两个序列相减获得差值序列，求差值序列自相关系数，估计差值序列
的方差（受自相关性的影响），最后求得 z 统计量做单边或双边检验(The program can be thought of: first subtract the two sequences to obtain the difference sequence, seek the autocorrelation coefficient of the sequence, estimate the variance of the difference sequence (affected by the autocorrelation), and finally calculate the z statistic as a unilateral or Bilateral test)