问题如下：
2.Which of the following is Chiesa’s best response to Question 2 regarding serial correlation in the error term? At a 0.05 level of significance, the test for serial correlation indicates that there is:
选项：
A.no serial correlation in the error term.
B.positive serial correlation in the error term.
C.negative serial correlation in the error term.
解释：
B is correct.
The Durbin–Watson test used to test for serial correlation in the error term, and its value reported in Exhibit 1 is 1.65. For no serial correlation, DW is approximately equal to 2. If , the error terms are positively serially correlated. Because the DW = 1.65 is less than for n = 431 (see Exhibit 2), Chiesa should reject the null hypothesis of no serial correlation and conclude that there is evidence of positive serial correlation among the error terms.
问下，这里查表，N是代表observation的个数＝431吧？然后用N＝430近似替代吗？
