O'Reilly logo

The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chi-Square Test for Independence

In addition to the goodness-of-fit test, the chi-square distribution can also test for independence between variables. To demonstrate this technique, I’m going to revisit the tennis example from Chapter 7.
 
If you recall, Debbie felt that a short warm-up period before playing our match was hurting her chances of beating me. After examining the conditional probabilities, I had to admit there was some evidence supporting Debbie’s claim. However, I’m not one to take this sitting down. I demand justice, I demand further evidence, I demand a recount. (Oh, wait a minute, this isn’t Florida.) I demand … a hypothesis test using the chi-square distribution!
 
Unbeknownst to Debbie, I have meticulously collected ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required