A researcher observes the body-mass index (BMI), the number of school meals eaten, and the sex for a sample of schoolchildren. What are the variables in the data set?
(A) Schoolchildren and the researcher
(B) Schoolchildren, BMI, and number of school meals
(C) BMI, number of school meals, and sex
(D) only BMI
Answer: (C) BMI, number of school meals, and sex
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