Maths Moment

I was desperate to check the sample correlation coefficient (r) of a list of sample that forms a scatter plot. I was aware that my graphing calculator could do that but when I finished keying in the information and then applying the LinReg (a + bx) function, I realised I could only obtain the ‘a’ and the ‘b’ constants of the regression line and not the coefficient. Thanks to my JC notes, I manage to learn how to get it to work.

So just a reminder for JC kids how to allow the LinReg function display the r and r-square figures: go to Catalog>DiagnosisOn. This is probably the only time you have to go to the Catalog menu in your entire JC H2 Mathematics life.

As for those interested to explore the capabilities of your Graphing Calculator for Chemistry, you can check out the last part of my Chemistry notes.