Leonard G. Johnson, Editor                                                 Wang H. Yee, Director

The Sample Size Puzzle

What sample size should I test?

What sample size is really best?

Tell me please, for I must know,

With what size sample I can go.

I'm losing sleep, and live in fear,

Because to me it's still unclear.

Oh puzzling riddle beyond compare,

I'd like to act, but don't quite dare.

Is my sample large enough

To keep things smooth instead of rough?

Will my test sample actually be

A representation of reality?

Don't tell me I must live like this

Not knowing whether I'll hit or miss.

How can I know the sample I choose

Will make me win instead of lose?

Whatever it is that I should decide

I want the samples such size

That decisions from them will be wise.

Leonard G. Johnson

June 2, 1979