Which of the following statements regarding interval scales is true?

Question

BlackTom AI · Accepted Answer

When assessing the nature of interval scales, it’s helpful to compare them to other scale types and note what features they possess or lack.
Option 1: 'More statistical analyses can be done with ordinal scales than with interval scales.' This is incorrect because interval scales, having equal intervals between points, actually permit a wider range of statistical analyses (e.g., means, standard deviations, and parametric tests) than ordinal scales, which only guarantee order and not equal distances.
Option 2: 'They have all the characteristics of ratio scales.' This is false since interval scales lack a true, meaningful zero point, which is essential for ratio comparisons (e.g., twice as much) that interval scales do not support.
Option 3: 'They have all the characteristics of ordinal scales.' This statement is accurate in that interval scales preserve the order of measurements like ordinal scales do, but in addition they provide equal intervals between adjacent values, which ordinal scales do not guarantee. In other words, interval scales extend ordinal scales by adding the property of equal intervals while retaining the ordering.
Option 4: 'They have an absolute zero point.' This is incorrect because an absolute zero point is a hallmark of ratio scales, not interval scales; interval scales do not have a true zero that implies absence of the quantity.
Taken together, the only option that aligns with the defining features of interval scales is the one that acknowledges both the ordering from ordinal scales and the presence of equal intervals, without claiming an absolute zero.

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Which of the following statements regarding interval scales is true?

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