# AS Biology - Line of best fit (Drawing graphs)Watch

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#1
I did an experiment on the effect of substrate concentration on rate of reaction.
My experiment didn't produce very concordant results. There is no pattern anywhere...they're just random

I'm plotting a graph with y-axis rate of reaction and x-axis concentration.

But I don't know how to draw the line of best fit? Is it a straight line to each point or straight line through the middle of all the points or is it curved?
0
7 years ago
#2
(Original post by ItsAnnaYay)
I did an experiment on the effect of substrate concentration on rate of reaction.
My experiment didn't produce very concordant results. There is no pattern anywhere...they're just random

I'm plotting a graph with y-axis rate of reaction and x-axis concentration.

But I don't know how to draw the line of best fit? Is it a straight line to each point or straight line through the middle of all the points or is it curved?
If wouldn't be a line of best fit if it were through all the points, so usually you'd draw a straight line connecting all the points as much as possible.

In this case, you want a curve as your graph should look something like this
0
#3
If wouldn't be a line of best fit if it were through all the points, so usually you'd draw a straight line connecting all the points as much as possible.

In this case, you want a curve as your graph should look something like this
So to draw the curve does it have to go through all points? (because I don't think my graph will look like that, because my results fluctuate, I'm worried it'll look like a zigzag)

Could you please explain to me what you mean by "you'd draw a straight line connecting all the points as much as possible."
Like dot to dot? or one straight line connecting points before the saturation point and another line after?

I fail at experiments.
0
7 years ago
#4
(Original post by ItsAnnaYay)
So to draw the curve does it have to go through all points? (because I don't think my graph will look like that, because my results fluctuate, I'm worried it'll look like a zigzag)

Could you please explain to me what you mean by "you'd draw a straight line connecting all the points as much as possible."
Like dot to dot? or one straight line connecting points before the saturation point and another line after?

I fail at experiments.
Nope, there's a difference between connecting all of the points by joining them up and drawing a line of best fit. A line of best fit is where you try and connect the points as much as possible with 1 straight line. Here's a quick example I've drawn on paint.

I've also attached a quick line of best fit which is curved. As you can see, the lines cannot go through all the points but it's close.
1
1 year ago
#5
when are you supposed to draw straight lines through each point?
0
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