The latest edition (3rd edition) of our A2 Complete Companion has an error on page 285. The two blue boxes under the heading ‘Truth’ are in the wrong order. It should be H1 is correct (There is something going on) first and then H0 (There is nothing going on) second). The true positive occurs when the […]

Type 1 and 2 errors are not easy to understand and recently one student (thank you Laura Hastings) wrote in to ask if we were also confused (!) and had made a mistake with Type 1 and 2 errors in our AQA A A2 book. Fortunately we hadn’t but the explanation was a bit unclear. […]