在重复抽样条件下,推断总体成数的必要抽样单位数目的公式为[*]。 ()
A. 正确
B. 错误
2006年甲地区实现国内生产总值132亿元,乙地区实现国内生产总值150亿元,则甲、乙两地区的比例相对数为88%。 ()
A. 正确
B. 错误
A.He was surely under huge pressure.B.The cafe was not one of his greatest achievement
A. He was surely under huge pressure.
B. The cafe was not one of his greatest achievements.
C. He did almost nothing significant.
D. He was the greatest leader of the students' union.
向下累计是将各组次数或频率从变量值小的组向变量值大的组进行累计。 ()
A. 正确
B. 错误