[名词解释] 超亲优势(over-parent heterosis)
[名词解释] 中亲优势(mid-parent heterosis)
[问答题] 试写出F1代超高亲优势和超标优势的计算公式。
[单选题]If nis large and the population standard deviation is unknown, the standard
[名词解释] standard deviation
[单选题]H.e explained everything over and over again ______anyone should misunderstand him.A. sinceB. whenC. lestD. as if
[单选题]A sample of 25 observations has a mean of 8 and a standard deviation of 15.
[单选题]A sample of 25 observations has a mean of 8 and a standard deviation of 15.
[问答题]Yeah, but they play the same songs over and over again.