[allmost]

They haven't really gone into the entire number of 'incidences' which is statistically significant. The most significant variable here, however, is the observer. I love this stuff. :)

The observer influences results.

[AFPhys]

I just looked to verify my memory. The first few top quark papers were base on low two-digit numbers of events and error bars were on the order of +/-10% ... though their “certainty that this was not random” was near one-in-a-million by the time of the “solid” dual announcements by CDF and D0, the two FermiLab collaborations in 1995.

Still looking for the paper here.