Lesson 5 - Sampling

Lesson Goals:

By the end of this lesson, students can:

distinguish between random, systematic, stratified, convenience and cluster sampling
identify the appropriateness of a sampling method in a given context.

Content:

Investigate reports of studies in digital media and elsewhere for information on their planning and implementation (ACMSP277)

investigate and evaluate the appropriateness of sampling methods and sample size used in reports where statements about a population are based on a sample

Working Mathematically:

Determine whether a sample used enables inferences or conclusions to be drawn about the relevant population (Reasoning)

Class Activities:

Sampling with skittles/counters (LIT)

The teacher presents each group with an array of coloured counters that represents the total population. The teacher presents the idea of taking a sample of counters that represents this population. The teacher gives a handout that details the instructions for each method of sampling, for example, pick out 25 random counters (random sampling) or line up the counters and pick every 3rd counter (systematic sampling).

Students record their results in a table, with headings of 'colour', 'number', '% of total sample'. The teacher asks prompting questions including: Do your results match your population? Is this a good method of sampling? Why/Why not?

Sampling Card Sort (ICT)

This resource involves matching infographics describing different sampling methods with their respective definitions and examples. Students will use this to self-assess and monitor their understanding of the different sampling methods.

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