I always lose marks in homeworks for the reasoning the anomalous results. It's normally the only section I lose marks in, evaluation, and it's getting a bit annoying.
Let's this we're measuring temperature changing after a reaction is underway. Why might one get an anomalous result? Perhaps misreading the thermometer, or the stopwatch?
It seems to me if it was adding too much/little of a reactant would cause all results to be wrong..?