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Grade 6 · unit review

Review: Describe Clean Structured Data

Validate schema id|count|category with count 0–9 and category red/blue. Inspect A|4|red,B|?|blue,C|2|red. State valid rows, missing-value handling and coverage.

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Unit review questions
1. Item count 18 used for addition. Which representation fits?
Need a hint?
  • Use the field’s meaning, not just its appearance, to select a type.
  • Converting identifier 007 to number 7 loses its written leading zeros.
2. Which value is the count?. Schema id|count|category. Record A|5|blue. Which value belongs to the requested field?
Need a hint?
  • Split at the stated separator and match fields to the schema order.
  • Do not assume the first field is always a name or that a missing field is zero.
3. idE,count 2.5,red. Contract: id nonempty; count whole number 0–9; category red/blue. Classify record.
Need a hint?
  • Apply every stated requirement and report the first relevant violation.
  • A plausible value can still violate the defined range or type.
4. Records contain counts 10,6,unknown. What is the known subtotal (not the complete total)?
Need a hint?
  • Add known values and report known/missing counts separately.
  • Do not present the known subtotal as the complete total.

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Use the skills in a new task

Validate schema id|count|category with count 0–9 and category red/blue. Inspect A|4|red,B|?|blue,C|2|red. State valid rows, missing-value handling and coverage.

Work on paper or in your own document. Explain the choices you made.

  • Use only supplied fictional inputs and state the relevant rule.
  • Include labeled steps or evidence for each decision.
  • Name one limitation or tempting mistake.
  • Check that the result meets the task and revise a justified error.
Compare with a model response

A and C satisfy the contract. B has an unknown count rather than a valid numeric value, so I flag it instead of inventing zero. The two known counts subtotal 6; one count is unknown, so the complete total remains unresolved.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.