Question
a set of data points has a correlation r= -0.86 your friend claims that because the correlation is close to -1 it is reasonable to use the line of best fit to make predictions is your friend correct explain your reasoning.
I say she isn't correct because she needs x and y to see if it's linear. Correct me if I'm wrong!
I say she isn't correct because she needs x and y to see if it's linear. Correct me if I'm wrong!
Answers
Jessica
No, you are correct. Great job!
Steve
I disagree. A coefficient near 1 indicates that the data points lie very close to the best-fit line. So, using the line should provide useful approximations.
The fact that we're even talking about a line of best fit indicates that the data are linear, or close to it. Otherwise, the coefficient would be near zero.
The fact that we're even talking about a line of best fit indicates that the data are linear, or close to it. Otherwise, the coefficient would be near zero.