[zaarn]

While I generally agree, I'm being more generic.

A single data point doesn't establish any direction or trend at all.

With two data points you can establish a trend and make a prediction about the next data point. However, any two data points form a line, so any two results can be used to make a trend, however wrong it may be.

Only when more points are used can you confirm the trend and reduce the probability of being (un)lucky.

[katrotz]

Two in a row is a coincidence, three in a row might be a rule