Development draft · local review needed

Day 13 · A percentage must name its test setYear 7 Inquiry · T1 W3–4 · Day 13 lesson

Prepare this lesson

Year 7 / Integrated / Term 1 / Weeks 03 04

Part of the full two-week lesson sequence. Check the pack guide and taught point before teaching.

Open for this lesson: Pack guide · Daily routes · Worked swaps · Fresh learner checks · Aids and text routes.

Teacher copy: This page may include teaching prompts or answer keys. Answer keys in this public library can be viewed by anyone. Give learners a clean prompt, use checks as formative evidence, and change a case locally when prior access matters.

Learner prompts

Codes: AC9S7I05, AC9M7N06, AC9E7LA02. Goal: calculate and evaluate Version 1/2 outcomes on ten fictional trials. Prepare: Version 1 ten-case log and a 10-cell tally strip.

Open · 3 min. “Eight safe outputs in ten model cases” is a count. Ask what population that statement does not describe.
Model · 5 min. Calculate 8/10=0.8=80% of these ten invented cases. Two mislabels make 2/10=20%; an unmatched output is not a mislabel if expected.
Investigate · 8 min. Compare Version 2 on exactly the same ten descriptions: 10/10 safe under the stated criterion. Difference is 2 of 10 cases, or 20 percentage points (100%−80%). Neither ratio predicts field accuracy.
Choice · 10 min. D13-A/B/C: tally chart, precise reader-facing caption or critique of “100% accurate for plants”. Require numerator, denominator, criterion and limit.
Check · 6 min. Repair “The revised key always works” as “It returned appropriate outputs for all ten tested fictional profiles; new profiles still need testing.”
Note · 3 min. Mark arithmetic and claim scope separately. If percentage is correct but generalised, give a fresh small test set to qualify.

Later/home: Optional tally extra; no classmate attributes or real biological records are collected.

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