Even numbered non-verbal rating scale using single adjectives instead of bipolar opposites is called

Staple Scale is the correct answer

The correct answer is **Stapel Scale**.

A **Staple Scale** is an even-numbered, non-verbal rating scale that uses **single adjectives** instead of bipolar opposites. It typically ranges from **-5 to +5** (without a neutral point) and helps measure attitudes toward a concept.

Thus, the correct answer is:

$\boxed{3}$ **Staple Scale**

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