NO.PZ2021091302000038
问题如下：
Homoskedasticity is best described as the situation in which the variance of the residuals of a regression is:
选项：
A. zero
B. normally distributed
C. constant across observations
解释：
C is correct. Homoskedasticity is the situation in which the variance of the residuals is constant across the observations.
across是围绕吗？