Discussion
If you are collecting data on a person's height, which type of data is this ?
Answer: D
Height is Ratio data.
Ratio data have equal intervals and a true zero, so ratios are meaningful: a person 180 cm tall is twice as tall as a child of 90 cm. Height, weight and time all have a true zero.
Interval data have equal intervals but no true zero (temperature in Celsius), ordinal data show only rank order (positions in a race), and nominal data only name categories (jersey numbers).
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