Question

which of the following variables can be classified as categorical? i. exam letter grade ii. time spent on exam iii. class population iv. phone number

Explanation:

Categorical variables represent types of data that can be divided into groups. An exam letter - grade (e.g., A, B, C) is a categorical variable as it falls into distinct categories. A phone number is a nominal categorical variable as it is just a label. Class population and time spent on an exam are numerical variables (the former is discrete and the latter is continuous).

Answer:

I. Exam letter grade, IV. Phone number