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Discussion in 'Science' started by pookyrobin, May 21, 2010.
So this graph should not be a dot to dot.
I have found instances in mark schemes where short straight lines are preferred over lines of best fit. This is likely the chosen option due to the sensitivity of variables in Biological research and an 'unknowing' of what is occurring between measured points.
This link is a great read:
Big discussion recently on this on the Biotutor list. I admit to not recalling it in full, but if I remember aright, the answer is "some exam boards allow it in some circumstances and some don't allow it in other circumstances."
OCR A level Biology has changed from allowing dot to dot graphs for the outgoing specifications to insisting on best fit lines for the incoming ones
Cambridge IGCSE Biology looks for dot-to-dot, but Physics for line of best fit. I'm quite sure of this because I mark Paper 6 (alternative to practical) for both subjects.
The teacher is probably following the mark schemes. Whether that is right or wrong is a different debate!