validity of oil linear model?

qwert

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Jun 26, 2013
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26
Question
the table gives an estimate of the amount of oil left, in x trillion barrels, in various years (t)

T. 1940. 1950. 1960. 1970. 1980. 1990. 2000. 2010
x ,3.42 , 3.21,3.05,2.76,2.41,2.15,1.82,1.21

Comment on the validity of the linear model.

Im not sure how to answer this question. Am I supposed to explain why it might not be practical to use this data to predict future oil amounts? Thank you!
 
Question
the table gives an estimate of the amount of oil left, in x trillion barrels, in various years (t)

T. 1940. 1950. 1960. 1970. 1980. 1990. 2000. 2010
x ,3.42 , 3.21,3.05,2.76,2.41,2.15,1.82,1.21

Comment on the validity of the linear model.

Im not sure how to answer this question. Am I supposed to explain why it might not be practical to use this data to predict future oil amounts? Thank you!

Find the regression coefficient (r) from the best fit linear model.

Then discuss.....
 
Find the regression coefficient (r) from the best fit linear model.

Then discuss.....

Thank you for the help!
I know r is -0.985 how should I continue from there? What am I supposed to know from finding the r? Thank you!
 
Thank you for the help!
I know r is -0.985 how should I continue from there? What am I supposed to know from finding the r? Thank you!

You need do some reading - and find out what does correlation coefficient (or regression coefficient) indicate.

Use Google - then come back tell us what you found.
 
You need do some reading - and find out what does correlation coefficient (or regression coefficient) indicate.

Use Google - then come back tell us what you found.

Yes I do know what r indicates. It's just that I can't seem to connect what I've learnt to this question.

Or does it mean that because r= -.985 (t and x have a strong negative linear correlation)and the data plots on the scatter diagram forms a rather straight line, it means that it is valid? oh ~:confused: I don't know what im talking about!
 
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