Guiding the Students of Cambridge International O Level and A Level

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A2 Practical Skills Paper In this case, students must concentrate on planning, data analysis and interpretation and evaluation. They must know about descriptive statistics and also when and how to use two statistical tests: the χ2 test and the t-test. To prepare for this paper, students should do practical activities that generate data which they can analyse using statistical methods. Planning There are many topics in the AS and A2 courses which lend themselves to planning. Past papers are, of course, a good source of these. This is a list of skills that students need in order to make a good experimental plan: 1 Identifying key variables. 2 Describing, including diagrams, a workable practical procedure. 3 Selecting appropriate methods for varying and measuring the dependent variable. 4 Selecting appropriate methods for measuring the independent variable. 5 Selecting appropriate methods for standardising (or controlling) other variables (known as controlled variables or c