Your work should involve taking a random sample as well as calculating and comparing confidence intervals.
Quite soon rising numbers of students taking the A-level examinations required more differentiation of achievement below the S-Level standard. Between 19 the grades were norm-referenced: The O grade was equivalent to a GCE Ordinary Level pass which indicated a performance equivalent to the lowest pass grade at Ordinary Level.
Measurements of trees, shells, etc, of different types and locations could also be compared.
Collect data from a population with a view to estimating population parameters (for example, and ) by using the estimation techniques in this module.
The criterion referencing scheme came into effect for the summer 1987 exams as the system set examiners specific criteria for the awarding of B and E grades to candidates, and then divided out the other grades according to fixed percentages.
Rather than awarding an Ordinary Level for the lowest pass, a new "N" (for Nearly passed) was introduced.