A researcher observes the weight, the height, the number of school meals eaten, and the sex for a sample of schoolchildren. Which variables are numerical and which are categorical?
(A) Numerical: sex, weight, height. Categorical: school meals eaten
(B) Numerical: school meals eaten. Categorical: sex, weight, height.
(C) Numerical: weight, height. Categorical: school meals eaten, sex
(D) Numerical: school meals eaten, weight, height. Categorical: sex
Answer: (D) Numerical: school meals eaten, weight, height. Categorical: sex
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