Which variable is continuous numerical data?

• A. Car model name
• B. Blood type
• C. Number of children
• D. Temperature in Celsius

Answer: (D)

Continuous numerical data are measurements that can take any value within a range, including fractions, because they lie on a continuous scale. Temperature in Celsius fits this: a reading can be 23.0, 23.5, 23.52, and so on, with values potentially arising at any precision based on the instrument's capability. The other possibilities are not continuous numerical data. A car model name is a label—text used to identify a category. Blood type is also categorical, representing distinct groups with no numerical ordering. The number of children is numerical but discrete, since you count whole individuals and cannot have a fraction of a person. Thus, temperature in Celsius is the continuous numerical data.