
Concept explainers
Coding Students who have accumulated fewer than 30 units are called Freshmen.
a. Create a new categorical variable, named Freshman, that classifies each student in Table 1A as a freshman (less than 30 units) or not a freshman. Call this variable Freshman. Report the coded values in a column in the same order as those in the table.
b. Was the original variable (college units) numerical or categorical?
c. Is your new coded column (Freshman) from part a numerical or categorical?

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