问一道题：NO.PZ201512020300000804

问题如下：

Based on Exhibit 2, Vasileva should compute the:

选项：

coefficient of determination to be 0.4689.

95% confidence interval for the intercept to be –0.0037 to 0.0227.

95% confidence interval for the slope coefficient to be 0.0810 to 0.3898.

解释：

C is correct. The confidence interval for the slope coefficient is calculated as:
Confidence interval = b1 ± t c * sb1
Where b1 = 0.2354, sb1 = 0.0760 and tc = 2.032
The lower limit for the confidence interval = 0.2354 – (2.032 × 0.0760) = 0.0810
The upper limit for the confidence interval = 0.2354 + (2.032 × 0.0760) = 0.3898