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Which of the following variables can be classified as categorical? Exam letter grade Time spent on exam Class population Phone number -I only -I and

Which of the following variables can be classified as categorical?

  1. Exam letter grade
  2. Time spent on exam
  3. Class population
  4. Phone number

-I only

-I and IV only

-II and III only

-II, III, and IV

-IV only

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