6．統(tǒng)計(jì)設(shè)計(jì)的首要環(huán)節(jié)是
A．確定統(tǒng)計(jì)研究的目的                             B．確定統(tǒng)計(jì)指標(biāo)
C．確定統(tǒng)計(jì)指標(biāo)體系                                D．確定統(tǒng)計(jì)分析的方法
7．統(tǒng)計(jì)調(diào)查是統(tǒng)計(jì)工作的
A．第一階段                                              B．第二階段
C．第三階段                                              D．第四階段
8．直線回歸方程 =a+bx中(      )
A．b為斜率                                               B．a(chǎn)為斜率
C．x為斜率                                               D．X為因變量
9．抽樣平均誤差減少 ，則樣本單位數(shù)(      )
A．增加3倍                                               B．增加4倍
C．增加2倍                                               D．減少 
10．季節(jié)比率大于1，是(      )
A．淡季                                                     B．旺季
C．平季                                                     D．不確定