A.If condition is satisfied B.Random sample of cases-Approxomately C.Use filter Variable D.Random sample of cases-Exactly
A.計(jì)算三門課程成績的平均分 B.計(jì)算三門課程成績的標(biāo)準(zhǔn)差 C.計(jì)算三門課程成績的方差 D.計(jì)算三門課程成績的總分
A.Both file iprovide cases B.External file is keyed table C.Working data file is keyed table D.Indicate case source as variable