Question: 2.40. An interval scale for which ratios are valid is called a ratio scale. Such scales have a well-defined 0 point, so, for instance, one

2.40. An interval scale for which ratios are valid is called a ratio scale. Such scales have a well-defined 0 point, so, for instance, one can regard the value 20 as twice the quantity of the value 10. Explain why annual income is measured on a ratio scale, but temperature (in Fahrenheit or Centigrade) is not.

Is IQ, as a measure of intelligence, a ratio-scale variable?

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