Features of a good sample

Another mnemonic...

While teaching one of this year's classes, I noticed that the Marking Instructions (MIs) from 2006 exam paper presented us with a good mnemonic for 'features of a good sample':

The question is: 'State the features of a good sample', and the MIs say:

Is representative of the target population; avoids bias; allows generalisation to the target population.

So we can have:

Generalisable
Representative
Avoids Bias

Or 'GRAB'.