Which statement about PROC MEANS is correct?

The correct statement about PROC MEANS is that it can use the CLASS statement for categorical variables. This functionality allows users to compute descriptive statistics separately for groups defined by the levels of categorical variables. For instance, if you have a dataset with a numerical variable (such as sales figures) and a categorical variable (such as product category), you can use the CLASS statement to specify the variable that defines the groups. This enables PROC MEANS to generate summary statistics for each product category, such as mean, median, and standard deviation, providing insights into the data that are stratified by different categories.

Using the CLASS statement enhances the analysis capabilities of PROC MEANS, as it facilitates the comparison of statistics across different groups within the dataset. It is important for summarizing data in a meaningful way, especially when dealing with heterogeneous data consisting of different categories.