Example 1: A police officer pulled a car for speeding in a 70 mph speed zone goi

Question

Example 1: A police officer pulled a car for speeding in a 70 mph speed zone going 85 mph and the same police officer pulled another car speeding in a 40 mph speed zone going 55 mph. However, both vehicles were going the same 15 mph over the speed limit.   

Example 2 : Household income in 10,000 bracket – group A earns 80,000, group B earns 90,000 and group C earns 100,000, group D earns 110,000. A group earns 10,000 less than B group, and C groups earns 10,000 less than D group.

(Question) which example of an interval scale that is given is really a Ratio Scale (with a true zero?)

Explanation / Answer

Example 1 is really a Ratio Scale (with a true zero).

REASON:

Example 1: Ratio scale: "0" on a ratio scale means the absence of that physical quantity. In Example 1, 0 mph means the absence of speed.

Example 2: Interval scale. In Example 2, we can find difference of two values: A group earns 10,000 less than B group.

In a Ratio scale, as given in Example 1, division is defined. Speed of 80 mph is twice the speed of 40 mph.

In an Interval scale, as given in Example 2, subtraction is defined. A gruop earns 10,000 less than B group.

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