问题 单项选择题

关于标准离差与标准离差率,下列表述不正确的是( )。

A.标准离差是反映概率分布中各种可能结果对期望值的偏离程度
B.如果方案的期望值相同,标准离差越大,风险越大
C.在各方案斯望值不同的情祝下,应借助于标准离差率衡量方案的风险程度,标推离差率越大,方案的风险越大
D.标准离差率就是方案的风险收益率

答案

参考答案:D

解析: 标准离差串是用来衡量风险大小,但其本身不是收益率,标准离差率乘以风险价值系数为风险收益串。

填空题
阅读理解

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项.选项中有两项为多余选项.

Speaking to a group can be difficult, but listening to a bad speech is truly a tiresome task—especially when the speaker is confusing. Don’t want to confuse your audience? Follow these suggestions:

1.__________

When it comes to understanding new information, the human brain needs a little time. First, we hear the words; then, we compare the new information to what we already know. If the two are different, we need to pause and think. But a breathless speaker never stops to let us think about what he or she is saying and risks confusing us. Slow it.

2.__________ 

Sometimes we all start a sentence one way and then switch directions, which is very difficult to follow. When you confuse your listeners with opposing information, you leave the audience wondering what part of the information is right and what part they should remember. Instead of relying and keeping correcting yourself, work to get the facts clear and straight.

3.__________  

Jumping from point to point as it comes to your mind puts the onus (责任)on your listeners to make up for your lack of organisation. And it’s confusing for them to listen, reorganise, and figure out what you’re saying all at once. But going smoothly from one point to the next helps them understand information more easily. You can arrange things from beginning to end, small to large, top to bottom or by some other order. Just be sure to organise.         

4.__________  

Repeated use of um, ah, like, you know and some other useless noises can drive an audience crazy. It makes the speaker sound uncertain and unprepared, and it can leave listeners so annoyed that they can’t pay attention. Recently I attended a speech that was marked by so many ums that audience members were rolling their eyes. Was anybody grasping the intended message? Um, probably not.

5.__________  

Many speakers finish up their speeches with question-and-answer (Q & A) sessions, but some let the Q & A go on without a clear end. The audience is often left confused about whether the meeting is over and when they can get up and leave. Do your listeners a favour by setting a time limit on questions, and close your speech with a specific signal—even if it’s something simple like, “If you have any more questions, you know where to reach me.”

Or even more to the point, conclude your speech with “Thanks for your time. ”

A. Be well-organised.

B. Close with a Q & A.

C. Don’t be contradictory.

D. Bring it to a specific end.

E. Speak slowly and pause.

F. Drop unnecessary words.

G.how to make life simple.