I am at the end of my tether with trying to sort out the statistics for my report. It's simple stuff but I am hopeless with statistics.

I've struggled for weeks trying to even work out what data to use and just when I thought I was getting somewhere it's gone a bit wrong. I think.

Basically I have 2 groups of cows:

A - those in their 1st or 2nd lactation n=24

B - those in their 3rd + lactation n=16

And for each group I have somatic cell counts. I wanted to see if there is a significant difference between the cell counts in young (group A) and old (group B) cows.

I did a t-test and it came up that apparantly these two sets of data ARE significantly different, which is great.

BUT! I don't know if my results are worth anything. I have now read somewhere that you can only use a t-test if the data is normally distributed, which I don't know if it is. Plus I am not sure if my sample sizes are big enough but I can't get any more cows.

I'm not a maths student and it's never been my strong point, hence I am really struggling with these statistics. I wanted to write a good report but it's overdue anyway and I am close to just giving up and submitting any old rubbish. :shakehead

Thanks for reading guys,

(very) Stuck