问题
解答题
| 附加题： （1）化简：
（2）方程x（x-1）=0的解为______． |
答案
（1）原式=2
．2
（2）由题意知，方程x（x-1）=0的解为x1=0，x2=1．
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| 附加题： （1）化简：
（2）方程x（x-1）=0的解为______． |
（1）原式=2
．2
（2）由题意知，方程x（x-1）=0的解为x1=0，x2=1．
An analyst does research about hypothesis testing and conducts a significance test to determine if the relationship between two variables is real or the result of chance. His null hypothesis is that the population correlation coefficient is equal to zero and his alternative hypothesis is that the population correlation coefficient is different from zero. He develops the following information:
| Value of the test statistic | 1.7081 |
| Critical value at the 0.05 significance level | 1.96 |
| Critical value at the 0.01 significance level | 2.58 |
A. one-tailed test and can reject his null hypothesis.
B. two-tailed test and can reject his null hypothesis.
C. two-tailed test and can not reject his null hypothesis.