Q42: Characteristic of interval level of measurement. - Fundamentals of Extension Education and Programme Planning - Agricultural Extension Education- ICAR JRF/SRF 2024 | Agrigyan

• Interval Level of Measurement Characteristics:
• In S.S. Stevens' typology of measurement scales (Nominal, Ordinal, Interval, Ratio):
• Interval Scale: Possesses rank order and equal unit distances (equal intervals) between successive points along the continuum (e.g., Celsius temperature scale, standardized IQ scores).
• Mathematical Operations: Permissible arithmetic operations include addition and subtraction of interval differences, calculation of means, standard deviations, and Pearson's $r$.
• No True Zero: Interval scales have an arbitrary zero point, not an absolute true zero (e.g., $0^\circ\text{C}$ does not indicate total absence of heat).
• Conclusion: Both (1) equal interval width and (3) permissible addition/subtraction are correct, making Option 4 correct.

Correct option: (4) Both (1) and (3)