Grade 5 · Science

Use test results to improve a prototype

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Example & extra help

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A paper bridge should hold at least 7 counters. The original holds [5, 6, 5] counters in three trials; after folding a side rail it holds [9, 8, 9]. What do these trials support?

The revision is guaranteed never to fail.
The results prove every possible side rail is best.
The revised model met the load target in all three recorded trials.
The original met the target in all three trials.

See the answer & why

The revised model met the load target in all three recorded trials.

All revised results are at least 7; all original results are below it. The evidence supports this tested revision under these conditions, not an unlimited guarantee.

A little hint: Compare every recorded trial with the success target; keep the conclusion within the evidence.

Record several trials of the original model using a defined success target.

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