Use randomized-experiment data and simulations to compare treatments and judge significance.
Find the treatment-minus-control difference in an experiment
Problem
The treatment mean is \(18\) and the control mean is \(14\). Compute treatment minus control.
Big Picture
What this problem is really about
Write the requested contrast symbolically before substituting the group means. Treatment minus control fixes both the subtraction order and the meaning of the sign: a positive result places the treatment mean above the control mean, while a negative result places it below. Interpret the magnitude in the response variable's units.
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