2013 A-level H1 Mathematics (8864) Question 9 Suggested Solutions

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

(i)

Graph for 9(i)

Graph for 9(i)

(ii)
From graphing calculator, r = 0.903

r-value is close to 1 which suggest a strong positive correlation between the variables x and y.

(iii)
From graphing calculator, required regression line: y = 4.46x + 87.43

(iv)
When x = 13.2, y = 146.

Since r is close to 1, and we used the regression line of y on x to estimate y given an x within the range of data, the estimate will be reliable.

KS Comments

Very standard. Some students made mistake while keying values into the GC unfortunately.

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