Decide whether a study design supports causal conclusions
Problem
Can this study design support a causal conclusion? Study: randomly assign plants to fertilizer or no fertilizer and compare growth
Big Picture
What this problem is really about
Causal support comes from how groups are formed, not merely from a difference in their outcomes. When researchers randomly assign the treatment and otherwise handle groups alike, preexisting influences are balanced on average, making the treatment the systematic difference; the conclusion still belongs to the represented subjects and conditions.
Inside Gozunta
Turn the preview into practice.
More than a preview
Gozunta lets you study this problem—and more than 10,000 others.
Create targeted learning sessions, use hints, check your answer, read the walkthrough, watch the video, print the work, and track your progress.
