Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta
    • Thread Starter
    Offline

    19
    ReputationRep:
    http://filestore.aqa.org.uk/subjects...W-QP-JAN10.PDF
    6bi?
    Am i always supposed to draw a curved line of best fit unless they say so?
    • Community Assistant
    Offline

    20
    ReputationRep:
    Community Assistant
    (Original post by Ayaz789)
    http://filestore.aqa.org.uk/subjects...W-QP-JAN10.PDF
    6bi?
    Am i always supposed to draw a curved line of best fit unless they say so?
    Are you sure you attached the right paper? There is nowhere in this paper asking for a best fit line...

    As a general rule however, the best fit line should be straight if the data looks mostly linear. If there is a curving trend then the best fit line should be curved. If you know the relation between the variables on the chart then that will tell you what shape the best fit line should be.
    • Thread Starter
    Offline

    19
    ReputationRep:
    (Original post by natninja)
    Are you sure you attached the right paper? There is nowhere in this paper asking for a best fit line...

    As a general rule however, the best fit line should be straight if the data looks mostly linear. If there is a curving trend then the best fit line should be curved. If you know the relation between the variables on the chart then that will tell you what shape the best fit line should be.
    Ive attached the right paper now sorry
    • Community Assistant
    Offline

    20
    ReputationRep:
    Community Assistant
    (Original post by Ayaz789)
    Ive attached the right paper now sorry

    Usually if you know the formula apply the right relation for the best fit line.

    For things like resistance and stress/strain etc. like in this example, where it is mostly straight, draw a straight line through the points and then when the trend becomes curved draw a curved best fit. Personally I'd extrapolate the straight line as a dotted line just to illustrate the regime change - but I don't know if that would be clear to an examiner.
    • Thread Starter
    Offline

    19
    ReputationRep:
    (Original post by natninja)
    Usually if you know the formula apply the right relation for the best fit line.

    For things like resistance and stress/strain etc. like in this example, where it is mostly straight, draw a straight line through the points and then when the trend becomes curved draw a curved best fit. Personally I'd extrapolate the straight line as a dotted line just to illustrate the regime change - but I don't know if that would be clear to an examiner.
    Ahh okay yeah i understand!
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: May 25, 2016
Poll
Do you agree with the proposed ban on plastic straws and cotton buds?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.