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 Probability and Statistics
 Interpretting Stem-Leaf plots
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Posted - 09/25/2007 :  22:11:04  Show Profile
Hello all,

I'm having a bit of trouble with one of the questions assigned for homework. The question reads:

The following stem-leaf display show individual grades separately for males and females. From these results, what would you conclude about any differences between males and females?"

I've scanned a picture of the stem-leaf plot: http://img.photobucket.com/albums/v646/supa69/stemleaf.jpg

My take at things: Firstly, this is purely descriptive analysis. No inferential procedures(i.e., t-test for independent samples) have been conducted, so we can't say the groups differ-significantly. However, by visual inspection, the distribution of female scores tends to be a bit negative. This means that a lot of females score high and may seem to find the course/test/exam/whatever easier, relative to the boys. I think my teacher wanted a more qualitative answer by just looking at the graph. I don't know what else to report? I'm pretty sure sample size has a role here and I know the boy's distribution is bi-modal.

Please, any help is appreciated.
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