Which statement is correct in relation to scales of measurement?
A. Ratio scale is having an absolute zero point
B. Interval scale is having an absolute zero point
C. Ratio scale is used in mental measurement
D. Interval scale is mental measurement
E. All the characteristics of ratio scale are included in the interval scale
Choose the correct answer from the options given below:

Correct option is C

The correct answer is (c): A and D only.
The ratio scale is characterized by the presence of an absolute zero point, meaning it not only measures the magnitude of differences between measurements but also allows the calculation of ratios because it has a non-arbitrary zero point indicating the absence of the quantity being measured. Examples of ratio scales include weight and height, where measurements can indeed be said to be twice as much as others because the scale has an absolute zero that signifies 'none' of whatever is being measured.

The interval scale is used for measurements where there is no true zero point, and it measures the intervals or differences between points. This scale is commonly used in mental measurement, such as IQ tests or temperature scales (like Celsius or Fahrenheit), where zero does not indicate the absence of the quantity being measured. Interval scales allow for the comparison of the magnitude of differences between measurements, but not the ratio of quantities because the zero point is arbitrary.