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Learning paths / Know who you are hearing
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Know who you are hearing

Compare selection methods and understand the limits of representation.

6 concepts13 minutes

01

Population

2 min · Who do you want your findings to describe?
02

Random sampling

3 min · Keep personal preferences out of selection.
03

Stratified sampling

2 min · Sample from every subgroup.
04

Cluster sampling

2 min · Select groups before individual units.
05

Convenience sampling

2 min · Recruit the people easiest to reach.
06

Selection bias

2 min · Who enters a study can systematically distort its result.
At the end of the path

Review in three questions.

Review the concepts in this path with short questions. Read the explanation after each answer and revisit a concept if needed.

1 / 3 · Cluster sampling

True or false?

Cluster sampling and stratified sampling are the same design.

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2 / 3 · Convenience sampling

True or false?

A thousand responses from friends automatically make a sample random.

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3 / 3 · Selection bias

True or false?

Selection bias necessarily disappears as sample size grows.

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