Y2 Ch1- Regression, Correlation, HT

Question 1

r value (product moment correlation coefficient) of 0.953 for graph of logE against logM.
State wether M = kE^n would be a good model.

Answer 1

• r value close to 1 (>0.7)
• strong +ve betw… (context)
• points lie close to straight line
• linear regression model = suitable

Question 2

Product moment correlation coefficient, r value, of the data is found to be -0.473.
Comment on the suitability of a linear regression model for these data. (2)

Answer 2

• r value > -0.7 –> weak -ve
• there may be other variables affecting relationship
• or a diff model might be a better fit