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An artist varied pressure in three practice samples but also used a different brush in each. Why is the conclusion unreliable?

Answer and explanation

Correct answer: Brush shape and bristles also change the result so the independent effect of pressure is unknown

The governing idea is a controlled comparison: to study the effect of pressure, brush type, size, paint load, surface, and stroke direction should remain constant. Here pressure and brush identity changed together, so any difference could be caused by either variable or their interaction. Option C correctly identifies a confounding variable. The other answers deny pressure, make a false universal claim, or wrongly reject practice samples.

Related tags

Brush ExperimentConfounding VariablePressure StudyControlled ComparisonBrush TechniquesPainting TechniquesArt EducationClass 9 Mcq

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