A stork was found in the cabbage

I found a powerful statistical potential of VKontakte and received an answer to a long-standing question. The fact is that among my friends about half were born in December and this worried me.

Disclaimer:
1) for a serious study does not claim;
2) I have something to do);
3) maybe not in the topic, but I do not know where, tell me.


')
Important: according to November 2007 - did a long time.

(If anyone is too lazy to recount - the columns are arranged in the order of the months of birth. That is, "April" - "January", "May" - "February")

Analysis
1. First, the distribution is uneven. And this is perhaps the most important conclusion. The difference between the maximum and minimum is 20% of the average. With this amount of data it can not be explained by chance.
2. In the summer - more in the winter - less. April is the peak.
Hypotheses:
1) The idea was expressed that this is really a failure in the winter months, and everything else is uniform. May falls out, because "Whoever weds in May, is toiling all his life." The same hypothesis confirms a maximum in August.
2) The second idea is that there are two peaks in general: one smeared in summer, the second - sharp spring. And he is not in March, because in March we are still mostly cold.
3. There is also a suspicion that the April peak is actually an artifact of “Contact.” People who are too lazy to choose the month will choose the first - that is, January. Well, in general, then you can take the required number of months.