Priya is investigating the relationship between the daily cost of heating her home in pounds (hhh) and the average daily temperature in degrees Celsius (ttt) during January.
She finds that the equation of the regression line is h=9.6−0.5th = 9.6 - 0.5th=9.6−0.5t.
Describe the correlation between Priya's heating cost 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 heating cost in the summer.
8 exam-style questions on Edexcel AS 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.