I often see similar statements on football (soccer) websites.
Team A has lost 4 out of their last 5 matches against Team B. (and thus, there is a high chance Team A will lose their next match tomorrow against Team B.
But if I procede to find out the matches played, the most recent of their last 5 matches would be something like 10 years ago! So in that span of 12 years (between 2000 and 2012), the entire team would have changed, the manager has changed etc.
So is it flawed to write statements like that?
Also, if a team just plays 1 game (assuming you can only win or lose, no draw), looking at their win percentage without seeing the number of games played could be misleading as the win percentage could be 100% or 0%. But as they play more games, you get a better idea of their "actual" win ratio. Is there some sort of statistical term for that?