I'm not a huge fan of 338 PA sample sizes and making conclusions off of them, but 338 PA in one season is infinitely better than 338 PA over 9 seasons which is what Crawford has played. That's an average of 38 Random PA/year over a 9 year span. You can see where the problems come. I naged about Bernadina because he hasn't been good whether it is in the big leagues or his indistinguishable minor league career. He hasn't shown anything. If someone shows that they are a good player over a 5383 PA sample size, I'm not taking a random 338 PA from that sample (6.28% of sample) against pretty good pitchers to make conclusions.
338 is a very substantial sample size, and it's a 100% sample of his Fenway PA's.
Try this Sample Size calculator, you'll find that 338 gives you a pretty high level of confidence that your sample is close to the actual performance over a much larger population.
http://www.surveysystem.com/sscalc.htm
