Identify which goal of experimental design ie reducing bias

Identify which goal of experimental design (i.e., reducing bias or limiting effects of sampling error) is aided by the following procedures below: a) Including extreme treatment levels? b) Using a paired design? c) Keeping room temperature constant in an experiment designed to test the effects of a pesticide on insect survival? d) Eliminating artifacts when designing the treatment of interest? e) Adding a sham operation group?

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