Using the large data set Colin studied the relationship between rainfall (rrr) and temperature (ttt) in Camborne. He took a sample of 12 days from May and June 1987 and obtained the following results.
| Rainfall (cm) | 3 | 0 | 5 | 1 | 3 | 8 | 1 | 5 | 0 | 7 | 3 | 5 |
| Temperature (°C) | 10.0 | 9.0 | 10.0 | 11.0 | 11.0 | 9.0 | 10.0 | 11.0 | 12.0 | 12.0 | 12.0 | 9.0 |
Use your knowledge of the large data set to explain why it is unlikely that Colin used a random sample.
Colin used a computer program to obtain the following statistics for Rainfall
Q1=1 Q_1 = 1 Q1=1 Q2=3 Q_2 = 3 Q2=3 Q3=5 Q_3 = 5 Q3=5Determine whether there are any outliers in the sample.
Plot the information on a scatter graph
Explain why a linear regression model may not be suitable for this data.
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.