# Scatter Graphs

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Thread starter 1 month ago
#1
How do you draw a line of best fit on a temperature-rate of photosynthesis graph? Is it a straight line or do you just draw a line straight through all the points as they are not in a line?
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1 month ago
#2
a line of best fit only has to be straight if the relationship is linear (a constant change). temperature and rate of photosynthesis aren't linearly related because at first temperate rise = more photosynethesis, then the rise gets smaller, then it starts to become negative as the temperature starts to denature the enzymes, right?
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Thread starter 1 month ago
#3
(Original post by HoldThisL)
a line of best fit only has to be straight if the relationship is linear (a constant change). temperature and rate of photosynthesis aren't linearly related because at first temperate rise = more photosynethesis, then the rise gets smaller, then it starts to become negative as the temperature starts to denature the enzymes, right?
Thats exactly what I thought, so I am pretty sure it would just be a line that goes straight through all the points, which creates a curve
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1 month ago
#4
(Original post by charxxhaikyuu)
Thats exactly what I thought, so I am pretty sure it would just be a line that goes straight through all the points, which creates a curve
yes, but remember, smooth line rather than sticking to each of the points. having a bit of deviation between the actual points and the line is fine - i think its called error (ie your experiment isn't perfect, but the line still captures the relationship)
Last edited by HoldThisL; 1 month ago
1
1 month ago
#5
If a smooth curve fits through all the point then go for that, otherwise you can try a curve which has the points roughly equidistant each side of the line. Statistically it’s quite complex to calculate lines of best fit and all the more so for curvilinear relationships
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Thread starter 1 month ago
#6
(Original post by HoldThisL)
yes, but remember, smooth line rather than sticking to each of the points. having a bit of deviation between the actual points and the line is fine - i think its called error (ie your experiment isn't perfect, but the line still captures the relationship)
Should it also begin from 0? Sorry that I am asking a lot but I just want to make sure I 100% get it correct haha.
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1 month ago
#7
(Original post by charxxhaikyuu)
Should it also begin from 0? Sorry that I am asking a lot but I just want to make sure I 100% get it correct haha.
yes it can start at 0 on either the x and/or y axis, but only if that's what you measurements show. if the data you have suggests there is still some photosynthesis at 0degreesC then you just go with what the data says
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