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Physics P5 questions

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Gaz:
Yup. I too am not sure of the definition of a line of best fit. Use this:
http://staff.argyll.epsb.ca/jreed/math9/strand4/scatterPlot.htm
It might help in understanding the line of best fit.

Onion:
True. Your first passes through more points but that's not the line of best fit for sure as 2 points are above the lines =)

For a line to be a best fit - it must passes through most points (though not necessarily) or most points must lie evenly along the line. For e.g. you can't have 2 points above the line (as in your first line) and none below. If 3 points are above the line, there should also be 3 points below - hence, evenly spread.

Hope it make sense =]

Gaz:
I just checked. Your right. There has to be just as many points above the line as below. One either way if the number of points are odd.

falafail:
hmm alright, thanks
i have another question.. in nov 09 the second variant, question 2 part d
to calculate the uncertainty i multiplied the percentage error in the gradient by the value i got for g, and i got 1.5
in the mark scheme it says to subtract the g you get from the gradient - g from worst acceptable line.. if i do that, i get 1.2

is my way also correct?

wildrider:

--- Quote from: falafail on June 08, 2010, 04:55:48 pm ---quick question:
which of these is considered the line of best fit?

this
http://i45.tinypic.com/29ys9c3.png
or this
http://i46.tinypic.com/k0od9d.png
??

--- End quote ---

the 2nd one is the line of best fit

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