Grade 9 · Science
Check measurement evidence before a design decision
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A team compares two water-level alarms, but one test uses a tilted tank.
What is the best next step for this engineering comparison?
- Level the tank and repeat the comparison under matching conditions.
- Record only the loudest alarm name.
- Change the tank and alarm at the same time again.
- Credit all differences to the alarms.
See the answer & why
Level the tank and repeat the comparison under matching conditions.
Tank tilt is a competing explanation, so the comparison should control it.
A little hint: Check the measurement system and competing explanations before judging the design.
Compare a sensor with suitable known reference values over the range being used.
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