Chi-Square For Us

Lyric copyright ©2006 by Lawrence Mark Lesser
may be sung to the tune of "Aquarius" (James Rado, Gerome Ragni, Galt MacDermot)

When you have qualitative data
And you need to test goodness of fit
Or do a test of independence,
Then this fine tool is it!
This is the dawning of the age of chi-square for us,
Age of chi-square for us,
Chi-square for us!
Chi-square for us!

It's the oldest test we use now--
In nineteen-hundred, Pearson showed us how
Reasoning with simple rat'os
yield expected frequencies that go in formula summation
note degrees of libera-ation:
chi-square for us, Chi-square for us!

(repeat first section)