A company investigates the relationship between the distance d d\,d miles travelled by a delivery van and the fuel f f\,f litres used. For 16 journeys, the regression line of f f\,f on d d\,d is f=0.091d+1.8f=0.091d+1.8f=0.091d+1.8.
Interpret the gradient in context.
Estimate the fuel used for a journey of 120 miles.
Explain why the intercept should be interpreted cautiously.
278 exam-style questions on CCEA A Level Maths 2.5 Data presentation and interpretation, covering 2.5.1 Data presentation and interpretation, 2.5.2 Data presentation and interpretation, 2.5.3 Data presentation and interpretation, 2.5.4 Data presentation and interpretation, 2.5.5 Data presentation and interpretation, 2.5.6 Data presentation and interpretation, 2.5.7 Data presentation and interpretation, 2.5.8 Data presentation and interpretation, 2.5.9 Data presentation and interpretation, and 2.5 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.