on 17-Sep-2018 (Mon)

Flashcard 3316115705100

Question
How to use the Chi squared test?
1. It's a goodness of fit. You compare a table
 i ... ... l j nij Lj ... ... c Ci n
To a table with eij being each cell's Lj×Ci÷n

Then
$$\chi^2=\sum_i^l\sum_j^c{(n_{ij}-e_{ij})^2\over e_{ij}}$$

OR if there is a eij <=5
$$\chi^2=\sum_i^l\sum_j^c{(|n_{ij}-e_{ij}|-.5)^2\over e_{ij}}$$

ie using the Yates correction

A right tail area < alpha rejects H0 , left tail < alpha means the fit is TOO GOOD.
Cheating in results?

status measured difficulty not learned 37% [default] 0

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