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Computer science · lesson 3 of 4

Cleaning and validation

Reordering rows according to selected values while preserving row relationships.

University8 practice questionsNotes + worked examples
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Learn the ideas

Prerequisites: Basic arithmetic and computer literacy.

Sort

Reordering rows according to selected values while preserving row relationships.

Filter

Temporarily showing only rows meeting stated criteria.

Data validation

Rules restricting or checking allowed cell entries.

Duplicate

A repeated record that may be legitimate or an error depending on context.

Worked examples

Example 1

Which term best matches this description: Reordering rows according to selected values while preserving row relationships.

Sort is the matching concept in this lesson.

Sort

Example 2

Which term best matches this description: Temporarily showing only rows meeting stated criteria.

Filter is the matching concept in this lesson.

Filter

Check your understanding

8 questions

Decimals or fractions are accepted for numeric answers. Proofs and written responses use sample answers and require human marking. This is practice, not a protected examination.

1 Which term best matches this description: Reordering rows according to selected values while preserving row relationships.

Show answer and explanation

Sort

Sort is the matching concept in this lesson.

2 Which term best matches this description: Temporarily showing only rows meeting stated criteria.

Show answer and explanation

Filter

Filter is the matching concept in this lesson.

3 Which concept would you apply first in a situation where rules restricting or checking allowed cell entries.

Show answer and explanation

Data validation

The scenario directly calls for Data validation.

4 Name the concept described as: A repeated record that may be legitimate or an error depending on context.

Show answer and explanation

Duplicate

The intended concept is Duplicate.

5 Which statement about Sort is most accurate?

Show answer and explanation

Reordering rows according to selected values while preserving row relationships.

The definition in the lesson notes gives the required condition.

6 Explain one important difference between Sort and Filter.

Sample answer and marking guidance

Sort: Reordering rows according to selected values while preserving row relationships. Filter: Temporarily showing only rows meeting stated criteria.

Credit a clear distinction using both definitions and an appropriate example if supplied.

7 Give a short example showing how Data validation would be used in practice.

Sample answer and marking guidance

A valid example should demonstrate this idea: Rules restricting or checking allowed cell entries.

Credit a relevant scenario that applies the concept rather than merely naming it.

8 Summarize why Duplicate matters in the lesson “Cleaning and validation”.

Sample answer and marking guidance

Duplicate matters because A repeated record that may be legitimate or an error depending on context.

Credit the core purpose, scope and any important limitation from the notes.

Further reading and review references

These are reference links, not copied exercises, institutional endorsement or proof of independent review.