Challenge Your Exam Readiness With Our Free ACT Practice Questions

The question provides average growth values with equal intensity across color treatments (stated explicitly: “lights of equal intensity”). Blue shows 7.3 cm, white 7.0 cm, red 6.1 cm, and green 3.2 cm. The student predicted blue would produce the most growth, and blue indeed has the highest mean. Therefore, the hypothesis is supported (Choice A). Choice B is incorrect because green has the lowest growth. Choice C is wrong since red’s 6.1 cm is less than both blue and white. Choice D claims intensity was not controlled, but the passage states the lights were of “equal intensity,” which is a control variable, so the hypothesis can be evaluated. On ACT Science, identify the relevant variables (color as independent, growth as dependent), check that controls are present (equal intensity, same duration, identical seedlings), and compare numerical results directly to the prediction. Since blue’s mean is the largest, the data align with the hypothesis; minor differences (e.g., blue vs. white) do not negate that support unless statistical testing or error bars suggest otherwise, which are not provided here.