Question: 2.40. Aninterval scale for which ratios are valid is called a ratio scale. Such scales have a well-defined 0 point, so, for instance, one can
2.40.∗ Aninterval 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 ratioscale variable? Explain.
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