Certified Forester Practice Exam

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Which scale of measurement assigns numbers for identification of specific species?

Nominal scale
Ordinal scale
Interval scale
Ratio scale

The correct answer is: Nominal scale

The nominal scale of measurement is designed to categorize data without any quantitative value. In the context of species identification, the nominal scale assigns unique identifiers to different species, allowing for classification based solely on their names or types. For example, if a forester is identifying various tree species in a forest, each species can be given a number or label (like "1" for Oak, "2" for Pine, etc.) simply to distinguish them from one another. These numbers do not imply any order or ranking; they are merely used as tags or identifiers to represent different categories of species. In contrast, other scales such as ordinal, interval, and ratio involve some form of ranking, measurement differences, or true zero points, which are not applicable when merely identifying or categorizing species without the implications of numerical values influencing their classification.