Core module sac help

[UncleXxx]

The question i'm being asked is *which of the 3 equations of least square regression line best enables travel time to be predicted form distance travelled.*
The 3 regression lines i have are: [Public transport] y=2.41x-3.81 , r=0.66 and r^2=0.43
                                              [Private transport] y=.99x+5.94, r=0.866 and r^2=0.75
                                              [Both public and private] y=1.11x+11.11, r=0.59 and r^2=0.35
Besides talking about the r and r^2 value, where higher r=stronger relation, what else could i talk about to determine the better regression line?               Note: y=time taken and x=distance travelled
                                                                                                              THank you =]

[akira88]

Well the only thing that you can talk about are the r and r^2 values
EDIT: Unless you do a residual analysis and then you would have a little more to talk about!

[UncleXxx]

awesome =] thanks for the help.
so the y-intercept and gradient has no relevance in determining the better regression line?

[crayolé]

awesome =] thanks for the help.
so the y-intercept and gradient has no relevance in determining the better regression line?

Nope ;]

[UncleXxx]

Aweeessomme  thank you to both of you.

[Visionz]

Private transport. 75% of the time it is explained.. blah..

amirite?

[crayolé]

Yeah, 75% of the variation in time taken(independent variable) can be explained by the variation in distance travelled(independent variable) the other 25% may be explained by other factors such as traffic conditions, weather etc.

The bolded bit may be completely left out but i like to include it just for the kicks or to show the teacher you've been studying ;P

[Visionz]

Yeah, 75% of the variation in time taken(independent variable) can be explained by the variation in distance travelled(independent variable) the other 25% may be explained by other factors such as traffic conditions, weather etc.

The bolded bit may be completely left out but i like to include it just for the kicks or to show the teacher you've been studying ;P

That doesnt really show that youve been studying. Its just shows youve got the capability to reason. One of the questions on my core SAC asked me to show this sort of reasoning.

[crayolé]

Yeah, 75% of the variation in time taken(independent variable) can be explained by the variation in distance travelled(independent variable) the other 25% may be explained by other factors such as traffic conditions, weather etc.

The bolded bit may be completely left out but i like to include it just for the kicks or to show the teacher you've been studying ;P

That doesnt really show that youve been studying. Its just shows youve got the capability to reason. One of the questions on my core SAC asked me to show this sort of reasoning.

Oh really? Maybe its just cos my schools standards are extremely low then ;P