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How many records

Why sampling exists at all

The tables you should stop guessing at

The ten per cent question

Choosing a sample

When the sample tells you something

Expanding the sample

Interviews as a sample

When a sample fails

How much evidence is enough. The prescribed sample sizes, what risk decides on top of them, when to expand, and why a fixed percentage is not the rule.

Nobody reviews every record. The standard tells you how many to pull.

Sampling: How Much Is Enough

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