10.同樣多的人民幣購買力下降了5%，則物價指數(shù)是

A.95%                                                             B.105% 

C.115%                                                            D.105.26%

11.相關(guān)關(guān)系的種類按其涉及變量多少可分為

A.正相關(guān)和負相關(guān)                                           B.單相關(guān)和復(fù)相關(guān)

C.線性相關(guān)和非線性相關(guān)                                 D.不相關(guān)、不完全相關(guān)、完全相關(guān)

12.指出下列哪種分組是按品質(zhì)標志分組?

A.企業(yè)按職工人數(shù)多少分組                             B.企業(yè)按資金擁有量分組

C.企業(yè)按行業(yè)分組                                           D.企業(yè)按設(shè)備擁有量分組

13.某產(chǎn)品不合格率為10%，則成數(shù)標準差是

A.10%                                                             B.90%   

C.9%                                                               D.30%

14.各項變量值皆不相同時，

A.眾數(shù)不存在

B.眾數(shù)就是最小的那個變量值

C.眾數(shù)就是最大的那個變量值

D.眾數(shù)就是居于中間位置的那個變量值

15.大量觀察法的數(shù)學依據(jù)是

A.大數(shù)定律                                                      B.中心極限定律

C.小概率原理                                                  D.貝努里定律

16.及格率指標是

A.強度相對指標                                               B.結(jié)構(gòu)相對指標

C.動態(tài)相對指標                                               D.比較相對指標

17.以樣本統(tǒng)計量估計總體參數(shù)，要求估計量的數(shù)學期望等于被估計的總體參數(shù)，這一數(shù)學性質(zhì)稱為

A.一致性                                                         B.有效性      

C.無偏性                                                         D.期望性

18.平均指標用來說明一個分布的

A.離中趨勢                                                      B.集中趨勢  

C.長期趨勢                                                      D.隨機趨勢

19.在數(shù)據(jù)的各種計量尺度中，有相對零點的計量尺度是

A.定類尺度                                                      B.定序尺度  

C.定距尺度                                                      D.定比尺度