| Exam Board | AQA |
|---|---|
| Module | S1 (Statistics 1) |
| Year | 2009 |
| Session | June |
| Marks | 10 |
| Paper | Download PDF ↗ |
| Topic | Bivariate data |
| Type | Calculate r from raw bivariate data |
| Difficulty | Moderate -0.8 This is a straightforward calculation of the product-moment correlation coefficient from raw bivariate data using standard formulas. While it requires careful arithmetic with 11 data pairs and computing sums of x, y, x², y², and xy, it's purely procedural with no conceptual challenge—students follow a memorized formula. The computational burden is moderate but this is a standard S1 exercise requiring only accurate calculation, making it easier than average. |
| Spec | 2.02c Scatter diagrams and regression lines2.02f Measures of average and spread5.09a Dependent/independent variables5.09c Calculate regression line |
2 Hermione, who is studying reptiles, measures the length, $x \mathrm {~cm}$, and the weight, $y$ grams, of a sample of 11 adult snakes of the same type. Her results are shown in the table.
\hfill \mbox{\textit{AQA S1 2009 Q2 [10]}}