某企业1997年至2003年产量X和利润Y的数据资料如表所示：
并已求得∑Y=251，∑X=413，∑Y2=9341，∑X2=26347，∑YX=15618，∑x2=1980，∑y2=340.857，∑yx=809，n=7。
请根据以上资料进行计算和分析判断，从备选答案中选出正确答案。
若对变量的显著性进行检验，则其原假设应为（）。
A．H0：β1≠0
B．H0：β1=0
C．H0：β1≠0
D．H0：β1=0
参考答案：B
解析：
对变量的显著性进行检验，其原假设与备择假设：H0：β1=0；H0：β1≠0。
| Read, choose and fill in the blanks. 用方框里的单词填空。 | |
How are things with you? After a summer holiday, it's time to back to school. I'm a middle school now. I'll have new teachers and . I think they are all and friendly. I hope I can more (更多的) friends. We are going to many subjects this year, Chinese, math, English, , art and so on. I Chinese best. I will study on math. I want to do well in my new school. Best wishes. Yours, Lucy |