问题
多项选择题
有关相关系数的说法，正确的有（）。
A.度量两个变量之间的相关性程度的指标
B.相关系数的大小范围和概率的大小范围一样，均为0到1
C.如果p=1，则X和Y有完全的正线性相关关系
D.如果p=0，则称X和Y不相关
E.相关系数越接近1越好
答案
参考答案：A, C, D
解析：相关系数的大小在+1和-1之间。
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有关相关系数的说法，正确的有（）。
A.度量两个变量之间的相关性程度的指标
B.相关系数的大小范围和概率的大小范围一样，均为0到1
C.如果p=1，则X和Y有完全的正线性相关关系
D.如果p=0，则称X和Y不相关
E.相关系数越接近1越好
参考答案：A, C, D
解析：相关系数的大小在+1和-1之间。
Around twenty years ago I was living in York. 31 I had a lot of experience and a Master’s degree, I could not find 32 work. I was 33 a school bus to make ends meet and 34 with a friend of mine, for I had lost my flat. I had 35 five interviews(面试)with a company and one day between bus runs they called to say I did not 36 the job. “Why has my life become so 37 ?” I thought painfully. As I pulled the bus over to 38 a little girl, she handed me an earring 39 I should keep it 40 somebody claimed(认领)it. The earring was painted black and said “BE HAPPY”. At first I got angry. Then it 41 me-I had been giving all of my 42 to what was going wrong with my 43 rather than what was right! I decided then and there to make a 44 of fifty things I was happy with. Later, I decided to 45 more things to the list. That night there was a phone call for 46 from a lady who was a director at a large 47 . She asked me if I would 48 a one-day lecture on stress(压力) management to 200 medical workers. I said yes. My 49 there went very well, and before long I got a well-paid job. To this day I know that it was because I changed my way of 50 that I completely changed my life.
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