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biology q

i dont understand q 04.3 on the aqa bio paper 3, how would dismissing the right and bottom lines ensure consistency? wouldn’t it also be consistent if all of them were accounted for?
Reply 1
(assuming this is the 2018 paper) if you were to count colonies on all four of the lines, it would be an overestimate, and likewise if you counted colonies on none of the lines it would be an underestimate.

trying to guess if the centre of the colony lies within the square could lead to human error, so only counting colonies on the top and left lines and ignoring those which lie on the right and bottom lines is the best compromise for repeatability, accuracy, and consistency.
(assuming this is the 2018 paper) if you were to count colonies on all four of the lines, it would be an overestimate, and likewise if you counted colonies on none of the lines it would be an underestimate.
Original post by military-sledge
(assuming this is the 2018 paper) if you were to count colonies on all four of the lines, it would be an overestimate, and likewise if you counted colonies on none of the lines it would be an underestimate.

trying to guess if the centre of the colony lies within the square could lead to human error, so only counting colonies on the top and left lines and ignoring those which lie on the right and bottom lines is the best compromise for repeatability, accuracy, and consistency.

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