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Evaluate Control Groups and Random Assignment
Grade Level
GRE
103 Evaluate Control Groups and Random Assignment
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A factory installs both a new sensor and new operator training on one assembly line, then credits the sensor for fewer defects. Which study design would best isolate the sensor's effect?
A
Randomly assign comparable lines to sensor-only, training-only, both, or neither conditions.
B
Ask operators whether the sensor display is easy to read.
C
Compare the treated line with a line using different raw materials.
D
Install the sensor only on the line with the fewest defects before the study, under every stated experimental condition.
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