All solutions here are SUGGESTED. Mr. Teng will hold no liability for any errors. Comments are entirely personal opinions.

(i)

(ii)

(iii)

Since the date points exhibit a curvilinear relationship with a negative gradient and concaving downwards, Model A is the most appropriate.

From the Graphing Calculator, r

(iv)

From the Graphing Calculator, required regression line:

### KS Comments:

The first part of this question tests students on their understanding of graphs. Students that have difficulties with this, should attempt to fit in simple values into graphing calculator.

2013 A-level H2 Mathematics (9740) Suggested Solutions | The Culture[…] Question 10 […]