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Option C is correct. The set statement is used within a DATA step to read an existing SAS data set. In this case, set sashelp.shoes; reads the SASHELP.SHOES data set, and data work.total; specifies the creation of a new data set named TOTAL in the WORK library. The options A, B, and D are incorrect because they either use the wrong syntax or are not proper statements for reading an input data set and creating an output data set.

References:

• SAS 9.4 documentation on the DATA step.

https://documentation.sas.com/?docsetId=proc &docsetTarget=n12jw1r2n7auqqn1urrh8jwezk00.htm&docsetVersion=9.4&locale=en#:~:text=ASCENDING%20is%20the%20default%20sort%20order.&text=In%20a%20PROC%20SORT%20KEY,is%20sorted%20in%20ascending%20order.

The default sort order for PROC SORT in SAS is ascending. This means that if no other sort order is specified, SAS will arrange the data in ascending order based on the values of the variable(s) listed in the BY statement.

Here's an example:

• proc sort data=mydata; by variable; run; sorts mydata by variable in ascending order by default.

The other options are incorrect in the context of the default sort order:

• A. 'Internal' is not a sort order.
• C. 'Formatted' refers to sorting data based on formatted values, not the default order.
• D. 'Descending' is an alternative sort order that must be explicitly specified with the DESCENDING keyword.

References:

• SAS 9.4 documentation for the PROC SORT statement: [SAS Help Center: PROC SORT]

The default length of numeric variables in SAS data sets is 8 bytes.

In SAS, the default byte size of a numeric variable is 8 bytes. This allows for a significant amount of precision and a wide range of numeric values to be stored within a numeric variable, regardless of the actual number of digits in the number being stored.

References:

• SAS documentation on numeric variables, SAS Institute.

The correct syntax for generating the mean and standard deviation for specified variables using PROC MEANS is shown in option A. The PROC MEANS statement specifies the dataset to analyze (data=class) and includes the options (mean std) directly in the PROC statement. The VAR statement then lists the variables for which the statistics should be calculated (Height and Weight). The other options listed in B, C, and D are not correct syntax for PROC MEANS.