NO.PZ202106160300004301
问题如下：
Based on Exhibits 1 and 2, if Liu were to graph the 50 observations, the scatter plot summarizing this relation would be best described as:
选项：
A.horizontal B.upward sloping C.downward sloping解释：
C is correct. The slope coefficient (shown in Exhibit 2) is negative. We could also determine this by looking at the cross-product (Exhibit 1), which is negative.
第一个问题中，题目的答案解释有些不太理解：
问题1：答案中说看表2，是不是看debt ratio为负值？
问题2：答案中说看表1的cross product,这个地方没有太理解为什么也可以看出斜率为负值？
