Newbie to stats - comparing pre & post test results with missing data


I'm a complete beginner to stats and I can't work out how I can analyse some data with SPSS despite it being very simple on the surface.

I have 2 lists of quiz test scores.

List 1 is scores for a group prior to receiving training.
List 2 is scores for the same group after receiving training.

None of the scores have any identifying participant information so I cannot match them against each other.

Also not everyone took part in the post-training test.

So for example: -

Pre-training scores = 14, 1, 13, 10, 3, 13, 13, 11, 14, 5
Post-training scores = 13, 15, 9, 15, 14, 15, 15

That's it, that's all the data I have. I know how to work out the mean but is it possible to analyse this kind of data any further?

I'm sorry for posting such a basic question but I'm hoping that a generous stats-wizard can help out a complete amateur!

Thanks very much!


TS Contributor
The typical analysis technique (if the data were paired) would be the paired t-test. Since you do not have the ability to pair the before and after, you are left with the 2-sample t-test. This test does not require the sample sizes to be equal. The drawback is that you lose power by not pairing the data. That is, you might not detect a difference with the 2-sample t-test that you would have detected using the paired t-test.