Black Jack wrote:MrGoat wrote:Black Jack wrote:
That's a very healthy sample size, actually.
We get political polls based on a much smaller % of population taken to be a good sign of public opinion. Just for example.
As someone who makes a living off of statistics I'll tell you this. Political polls are based on usually around a thousand people or so which is actually a much better sample size than this even if the percentage of the population is way smaller. Starting at about a sample size of 30 you'll have roughly a 95% chance of the results roughly matching the population depending on the amount of parameters you have though still the bigger the sample size the better and the more confident you can be the sample is representative of the population, the problem with political polls is finding a truly representative sample thanks to archaic sampling methods. That could also be a problem here because we don't know how these players were sampled, the distribution of which teams were sampled could matter here
I mean, you said 30 and they used 90 which also happens to be one fifth of the league. I never heard of political polls that managed to get to 1/5 of the entire electorate. As a professional maybe you know better than I do though.
What I'm trying to say is the percentage matters less than the actual sample size, which is the main reason why with extremely large samples they don't try to match the percentage because that would be cost prohibitively expensive, but a corrupted sample can still hurt the numbers. You need a legitimate unbiased sample and that's not always an easy task