如下

问题如下：

Identify which chart, among Charts 2, 3, and 4, is most likely to be used to assess homoskedasticity.

选项：

A.Chart 2 B.

Chart 3

C.Chart 4

解释：

C is correct. To assess homoskedasticity, we must evaluate whether the varianceof the regression residuals is constant for all observations. Chart 4 is a scatterplot of the regression residuals versus the predicted values, so it is very usefulfor visually assessing the consistency of the variance of the residuals across the observations. Any clusters of high and/or low values of the residuals may indicatea violation of the homoskedasticity assumption.