CLASSROOM NOTES Sensitivity of the ?<sup>2</sup> Goodness-of-Fit Test to the Choice of Classes.


Authors: 
Mooney, J. & Jolliffe, I.
Editors: 
Goodall, G.
Category: 
Volume: 
26(1)
Pages: 
22-23
Year: 
2004
Publisher: 
Teaching Statistics
Abstract: 

The ?<sup>2</sup> goodness-of-fit test is often one of the first tests of hypotheses encountered by students. When some of the expected frequencies are small, classes need to be combined. A real-life example is given that illustrates a surprising sensitivity of the results of the test to the way in which such combinations are chosen.

The CAUSE Research Group is supported in part by a member initiative grant from the American Statistical Association’s Section on Statistics and Data Science Education