Reteach: propose a relevant test

A proposal needs a relevant test

Fictional response: “The new seam made the sleeve better. Its water finished lower, so the seam alone caused the improvement.”

Room 22°C; cups/lids and duration match, but water mass and start differ. One comparison, not repeated trials. Covered liquid water; cups/lids, duration, exposure and reading procedure match within and across trials. Surroundings stay at the stated room temperature. No ice, phase change, active heating/cooling, direct sunlight or meaningful evaporative cooling. Accuracy is not supplied.

Supplied design record

Constructed teaching data: these values were invented for this activity, not collected in an experiment.

1. Calculate each change. What can be described? Why can neither the endpoints nor subtraction isolate a design improvement here?

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2. Plan a more informative comparison. Distinguish comparing old and new complete designs from isolating a seam’s effect. State how you will retain unexpected or missing readings.

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