查 $\chi^2$ 分布表，$\chi^2_{0.95}(6)=$______ ，$\chi^2_{0.025}(15)=$______ . (注：小数点后保留四位)

设随机变量X和Y都服从标准正态分布，则以下哪个正确？（\chi^2(n)表示自由度为n的卡方分布) A: X+Y~N(0,2) B: X^2+Y^2~\chi^2(2) C: X^2和Y^2都服从\chi^2(1) D: X^2/Y^2~F(1,1)

7.printf(“%5.3s,%-5.3s,%2.3s”, “China”, “China”, “China”); 以上语句的运行结果是_______。 A: □□ina, ina□□,ina B: □□Chi, Chi□□,Ch C: Chi□□, □□Chi, Chi D: □□Chi, Chi□□,Chi

printf(“%5.3s,%-5.3s,%2.3s”, “China”, “China”, “China”); 以上语句的运行结果是_______。 A: □□Chi, Chi□□,Chi B: Chi□□, □□Chi, Chi C: □□ina, ina□□,ina D: □□Chi, Chi□□,Ch

(3). 对于单正态总体，若均值 \( \mu \) 已知，则方差 \( \sigma ^2 \) 的假设检验问题，需要用到的统计量的分布为（）。 A: \( N(0,1) \) B: \( t(n-1) \) C: \( \chi ^2(n-1) \) D: \( \chi ^2(n) \)

(3). 对于单正态总体，若均值 \( \mu \) 已知，则方差 \( \sigma ^2 \)<br/>的假设检验问题，需要用到的统计量的分布为（）。 A: \( N(0,1) \) B: \( t(n-1) \) C: \( \chi ^2(n-1) \) D: \( \chi ^2(n) \)

In terms of tai chi, which of the following is NOT true? A: Tai chi is a fist fighting of mind and qi. B: Tai chi best symbolizes Chinese people’s philosophical ideas. C: The principle of fighting in tai chi lies in offense. D: Tai chi is composed of eight hand moves and five footwork moves.

【单选题】Which statement is incorrect about Chi Fu in Disney Mulan? A. Chi Fu complained that Mulan was meant to murder him on purpose. B. Chi Fu said Mulan was not worth protecting. C. Chi Fu was fair in judging Mulan’s doings. D. Chi Fu bore gender discrimination against women.

以下程序的输出结果是(注:口表示空格)()。 A: *s1=chinabeijing口□□**s2=**chi* B: *s1=chinabeijing口□□**s2=chi口口* C: *s1=*□口 chinabeijing**s2=口口chi * D: *s1=口□□ chinabeijing*s2=chi口口*

【单选题】某小麦品种在田间出现变异植株的概率为0.0045,今调查100株,恰好有2株出现变异的概率用SAS命令计算语句正确的是:【 】 A. probbnml(0.0045,100,2); B. 1- probbnml(0.0045,100,2); C. cdf("BINOMIAL",2,0.0045,100); D. cdf("BINOMIAL",2,0.0045,100)-cdf("BINOMIAL",1,0.0045,100);