Monday, December 17, 2012

"Dear ed115ers,
Yes, we do walk our talk...
We computed the Cronbach's alpha for
the final exam and found it to be a respectable .87
The mean difficulty index for the items was .74
The mean discrimination index was also good at  .34
We did notice a few items that we can improve upon, but we were pleased overall, not just with the final exam but with all the work you all put into the course and the learning you made happen. Impressive achievements all around!"

~k & k

\alpha = {K \over K-1 } \left(1 - {\sum_{i=1}^K \sigma^2_{Y_i}\over \sigma^2_X}\right)

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