Question

Which characteristic of a data set makes a linear regression model unreasonable?

a slope close to 0

a correlation coefficient close to 0

a slope close to –1
a correlation coefficient close to –1

Answer 1

If the data are not correlated (i.e. correlation coef=0), then creating a prediction model as a function of totally independent data has no value.

Answer 2

Can you dumb it down for me?

Answer 3

So if your data are like this, uncorrelated:

And you try to create a regression model from it like this: