C咋算的？

问题如下：

which of the following should Liu conclude from the results shown in Exhibit 2?

选项：

A.The average short interest ratio is 5.4975 B.The estimated slope coefficient is different from zero at the 0.05 level of significance C.The debt ratio explains 30.54% of the variation in the short interest ratio

解释：

B is correct. The t-statistic is -2.2219, which is outside the bounds created by the critical t-values of +2.011 for a two-tailed test with a 5% significance level.

The value of 2.011 is the critical t-value for the 5% level of significance (2.5% in one tail) for 48 degrees of freedom. A is incorrect because the mean of the short interest ratio is 192.3/50 = 3.846.

C is incorrect because the debt ratio explains 9.33% of the variation of the short interest ratio.