QCAA General Maths EA Practice Questions - QCAA General Mathematics External Assessment (Queensland) Exam

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A least-squares line is given by y = 3.5x + 12, where y is predicted sales (in $1000s) and x is advertising spend (in $1000s). What is the predicted increase in sales for each extra $1000 of advertising?

$$12,000 $$3,500 $$15,500 $$3,500,000

Correct Answer:

$$3,500

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