Vassilis Hartzoulakis wrote: > Dear all > I am a teacher of English trying to analyse the findings from an > experiment I conducted within the framework of my dissertation. > > After establishing homogeneity in the level of knowledge of English > among a number of my students, I ended up with a group of 64 > homegeneous (in the level of English) learners. I conducted a pretest on a > specific grammatical point. I chose the ones (24) who showed no knowledge > of the point whatsoever. > > Afterwards I taught this point to those students in two different ways and > tested them (posttest) giving the exact same test I had used as a pretest > (they knew nothing about the first results). > > What I want to find, is a proper model for analysing the findings. > > I am an SPSS novice (I have spent hours downloading documents and > trying to get my hand to it), and my last hope is to get a some help > from a statistician. > Thank you > Vassilis Hartzoulakis
You need to form a variable for improvements: Post subtracted by pre. So that the inproved performance is measured for all individuals. Then: did you teach those who had no knowledge in the matter (24) in one way and those who had some knowledge (40) in another way? If so I think you are in trouble, since you can't tell if the difference in improvement between the two groups was due to the difference in knowledge before learning or due to method used. I also believe you might have used randomization (if course participants had not refused this) to form the two groups from the 64. Then you also could have noticed if improvement was different across different pre-knowledge of the matter and whether a difference between groups would be similar across different pre-knowledge. Hope I'm wrong about my doubts. /Rolf Dalin ************************************************** Rolf Dalin Department of Information Tchnology and Media Mid Sweden University S-870 51 SUNDSVALL Sweden Phone: 060 148690, international: +46 60 148690 Fax: 060 148970, international: +46 60 148970 Mobile: 070 6740094, intnational: +46 70 6740094 mailto:[EMAIL PROTECTED] http://www.ite.mh.se/~roldal/ ************************************************** . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
