Choose a Data Type for Meaning
Use the field’s meaning, not just its appearance, to select a type.
About 18 minutes, plus any extended practice
Open lesson 1Describe 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.
Before you begin
- Read a simple table and distinguish unknown from zero.
Choose by skill rather than age alone. Read with an adult when useful, revisit a lesson, or explore another grade.
Follow the lesson sequence
Read a Delimited Record with Its Schema
Split at the stated separator and match fields to the schema order.
About 18 minutes, plus any extended practice
Open lesson 2Define a Validation Rule before Cleaning
Apply every stated requirement and report the first relevant violation.
About 18 minutes, plus any extended practice
Open lesson 3Report Coverage before a Summary
Add known values and report known/missing counts separately.
About 18 minutes, plus any extended practice
Open lesson 4Review and transfer
After the lessons, try 4 new review cases and a practical task. Each answer has an explanation and a link back to the related lesson.
Open the unit reviewGuest answers are temporary. Keep your own paper or document; this unit does not certify completion or record a school grade.
Topic references
- 2026 CSTA PK–12 Computer Science Standards: topic reference — Data & Analysis
These references informed the topic selection. They do not certify complete standards alignment.