Priya is investigating the relationship between her daily energy bill in pounds (eee) and the average daily temperature in degrees (ttt) each day in the winter.
She finds that the equation of the regression line is e=6.8−0.5te = 6.8 - 0.5te=6.8−0.5t
Describe the correlation between Priya's bill and the average daily temperature.
Give an interpretation of the gradient of this regression line.
Explain why this model might not be appropriate for Priya's energy bill in the summer.
46 exam-style questions on Edexcel A Level Maths Correlation, covering 4.1 Correlation and 4.2 Linear Regression. Each one has a worked solution and a mark scheme showing where the marks go.