理财产品按基础资产分类，则各类面临的风险有（）。

It ______ 12 rabbits to test a sample of vaccine, now it takes only 6.

A．used to taking

B．used to take

C．is used to take

D．was used to taking

The test statistic,, has a large sample chi-squared null distribution with df=？

By saying hat the Greenland sample may be "low-hanging fruit" (Line 1-2, Para. 6), the researchers meant that _______. A) the sample was favorable for their test B) the sample made the test more difficult C) the sample brought about litde benefits D) the sample produced unexpected results

考虑如下代码，其中包括一个内嵌类： public final class Test4 { class Inner { void test() { if (Test4.this.flag) { sample(); } } } private boolean flag = false; public void sample() { System.out.println("Sample"); } public Test4() { (new Inner()).test(); } public static void main(String args []) { new Test4(); } } 结果为？

A、输出 "Sample"

B、程序无输出，但正确终止

C、程序不能终止

D、程序编译失败

Which of the following statements are TRUE？

I. A two-tailed test on a large sample with a significance level of .01 has confidence intervals of + 1.96 s/ n.

Ⅱ. A hypothesized mean of 3, a sample mean of 6, and a standard error of the sampling means of 2 give a sample Z-statistic of 1.5.

Ⅲ. A Type I error is rejecting the null hypothesis when it was true and a Type Ⅱ error is accepting the alternative hypothesis when it is false. IV. When the sample Z-statistic is greater than the critical Z-statistic in a two-tailed test you should reject the null hypothesis and accept the alternative hypothesis.

A.I and Ⅲ only.

B.Ⅱ and IV only.

C.Ⅱ, Ⅲ, and IV only.

D.I, Ⅱ, Ⅲ, and IV.