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Learn

Module overview

Why sample size matters

A quick margin of error

The two wrong calls

The five inputs

Setting alpha

Setting beta

Setting delta

Sensible starting values

Which calculation?

Using Minitab

A power table: 1-sample z

Trade cost against precision

A power table: 1-sample t

When the sample is fixed

Sustainability lens

Practise

Sample size practice: question 1 of 10

Sample size practice: question 2 of 10

Sample size practice: question 3 of 10

Sample size practice: question 4 of 10

Sample size practice: question 5 of 10

Sample size practice: question 6 of 10

Sample size practice: question 7 of 10

Sample size practice: question 8 of 10

Sample size practice: question 9 of 10

Sample size practice: question 10 of 10

Review game

Sample size crossword

Chapter 22 of the Green Belt handbook covers sample size. You will see how sample size links to margin of error and to the two kinds of wrong call, learn the five inputs a calculation needs, set sensible values for each, and read a power table.

Sample Size: How Much Data Is Enough?

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