Simple t-test problem, why am I so lost

[faquewdikhed]

I am doing a study in my health and fitness class relating mens and womens VO2Max (lung capacity basically).

I think I have all of the relevant data:

n1=358, mean=38.95
n2=200, mean=44.89

When I calculate that to get my t-value, I get -3.423 for my t-value. I have no idea what this means, or how to find out. Help?
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