A variable represents the weight of a person. What type of data does it represent?
The weight of a person can be both comparable as well as it will change over time(Increase or decrease). So weight should be both ratio and Interval variable, right?
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The "Ratio" level of measurement possesses (i) all properties of the "Interval" level; and (ii) in addition, it can accommodate absolute zero.
Therefore, the variable "weight" is considered as "Ratio" level [which already implies that this variable is "Interval"]
Similarly, the "Interval" level of measurement possesses all properties of the "Ordinal" level; and the "Ordinal" level possesses the property of the "Nominal" level.
Hope this helps.
