问题如下:
2. The 95 percent confidence interval for the regression coefficient for the pre-offer price adjustment is closest to:
选项:
A. 0.156 to 0.714.
B. 0.395 to 0.475.
C. 0.402 to 0.468.
解释:
B is correct.
The 95% confidence interval is 0.435 ± (0.0202 × 1.96) = (0.395, 0.475).
何时使用双尾检验,何时使用单尾检验?这道题从哪里看出要使用双尾检验?