选择的假设检验是
A.配对t检验
B.F检验
C.t检验
D.四格表X2检验
E.行X列表X2检验
参考答案:D
小杰在学习“线段与角”章节有关知识时,有如下说法:
(1)两点之间线段最短;(2)如果∠α=53°38',那么∠α余角的度数为36°22';
(3)互补的两个角一个是锐角一个是钝角;(4)一个锐角的余角比这个角的补角小90°.
你认为小杰以上说法正确的个数为( )
A.1个
B.2个
C.3个
D.4个
When he was questioned about the necklace, he__________that he had ever seen it.
A.hesitated
B.refused
C.denied
D.rejected