Re: design question

Posted by Art Kendall on Sep 29, 2013; 11:26am
URL: http://spssx-discussion.165.s1.nabble.com/design-question-tp5722312p5722315.html

WRT the second design.  With today's software why not build classroom into the analysis.

Is it really practical to split a class into two methods of teaching?
On 9/29/2013 1:00 AM, Zdaniuk, Bozena-3 [via SPSSX Discussion] wrote:

If I want to test impact of new math teaching method on kids' learning i can do one of two designs:

1. I pick 20 classes and use the new method in ten of them and teaching as usual in the other ten. I do pretest and post-test and then compare the change scores between the two groups of classes (kids)

2. I pick 20 classes and use new method for HALF of the students of each class and teaching as usual for the other half of students in the class. I do pretest and post-test and compare the change scores between the two groups of kids. 

Is one design preferred to another? My colleague claims that the second design allows me to not worry about the effect of the classroom. What do people think? Any reference to written discussions on the topic are appreciated.

bozena 

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