help (urgent )

[Vince2222]

i am not sure if i am doing it right
http://www.mediafire.com/view/?n2qevgdx7ch5v65
-The first graph is a scatter box ,which means it is an linear
-Second graph is a residual plots which is a  random patten because the residual are randomly scattered above the x axis .This indicates it is an linear relationship .
The regression line is 1402.47*X+346.11
R=0.73
R^2=52%

-But if  i have to transform it would I have to uses    y-versus log10 (x)  formula

[Stick]

This problem seems to be popping up a lot this year. You shouldn't have to transform a data set if it already appears linear and the residual plot shows no pattern. Check if you've made a mistake in entering your data.

[Vince2222]

hey thanks for the reply stick  going to double check now.But what  happen if my data is correct and should i reply to those question like this? -Their is no transformation  because the residual plot is a random patten and the residual are randomly scattered above the x axis .Also the scatter plot is already a linear.

[lala1911]

Having the same issue.. 
My graph is in a strong positive direction however all the transformations result in the regression line decreasing.. although part of the SAC tells us that we must apply a transformation to the data.

I actually think it doesn't matter if its stronger or weaker, because in my SAC we have to explain which scatterplot is more appropriate to use which I will say that the original one is better.

[Stick]

Having the same issue.. 
My graph is in a strong positive direction however all the transformations result in the regression line decreasing.. although part of the SAC tells us that we must apply a transformation to the data.

I actually think it doesn't matter if its stronger or weaker, because in my SAC we have to explain which scatterplot is more appropriate to use which I will say that the original one is better.

That's the only valid question they can ask in this case. Pretty pointless in my opinion, but schools can do what they want I guess.

[lala1911]

That's the only valid question they can ask in this case. Pretty pointless in my opinion, but schools can do what they want I guess.

Yeah. However I don't see the point in schools doing data analysis SACs as the exams are based primarily on chapters 1-4, while Data Analysis SACs are generally based on chapters 5-6 (of the Essential Further Mathematics textbook that is).

[Stick]

Mine covered pretty much everything except time series data.