No. :p I have a smaller brain size and I'm analytical to the point of having been criticized by my female peers (when I was younger), for thinking too much! lol. At the same time I'm empathetic and intuitive. I had an IQ test years ago and they determined that both my left and right brains are equal in strength, one does not dominate.
I think that general statements about male and female brain sizes, or analytical and spacial skills are just statements of averages. We all know that in actuality there are bell curves.
... besides, there are female engineers!
Leah, must anxiousness and irritability be tied to hormones? They are during adolescence, PMS, menopause and IMS, but lots of people both male and female are irritable and anxious outside of these times.