Educational Statistics

Syllabus head (iv) — Educational measurement and evaluation | Chapter 3 of 18

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Why this chapter matters

Statistics is the third leg of the Measurement & Evaluation block (~30% of the paper, ~90 of 300 marks, together with Chapters 1 and 2). The 2022 paper asked direct numericals — z-scores, coefficient of variation, skewness ordering, normal-curve percentages — and definitional items on central tendency and correlation.

The good news: the exam uses only friendly numbers. Every question is designed to be solved without a calculator in under 90 seconds — if you know which formula to reach for. This chapter teaches every formula from zero.

What this chapter covers

• PREREQUISITES
• ORGANISING DATA
• MEASURES OF CENTRAL TENDENCY
• MEASURES OF VARIABILITY (DISPERSION)
• THE NORMAL PROBABILITY CURVE (NPC)
• SKEWNESS AND KURTOSIS (shape of the distribution)
• STANDARD SCORES: z, T, STANINE, STEN, PERCENTILES
• CORRELATION
• INTELLIGENCE QUOTIENTS: IQ, EQ, AQ
• THE EXAMINER'S ANGLE (whole-chapter summary)
• COMMON ERRORS THAT COST MARKS
• COMPRESSED REVISION SHEET

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