IGCSE Cambridge Statistics: Exam Techniques and Marking Criteria | IGCSE 剑桥统计：答题技巧与评分标准

📚 IGCSE Cambridge Statistics: Exam Techniques and Marking Criteria | IGCSE 剑桥统计：答题技巧与评分标准

This guide explains how Cambridge IGCSE Statistics answers are marked and how to write responses that gain full credit. It covers command words, method and accuracy marks, rounding, diagram drawing, probability, and common errors.

本指南解释剑桥 IGCSE 统计考试的评分方式，以及如何写出能获得满分的答案。内容涵盖指令词、方法分与准确分、舍入、统计图绘制、概率以及常见失分错误。

1. Understanding the Command Words | 理解指令词

Cambridge questions use command words such as “calculate”, “describe”, “compare”, “interpret”, “estimate”, “explain” and “justify”. Each word tells you how much working and what style of answer is expected. For example, “calculate” means show your method and give an exact or suitably rounded answer, while “describe” means state the trend, shape or features shown by a graph or data set.

剑桥考题会使用 “calculate”、”describe”、”compare”、”interpret”、”estimate”、”explain”、”justify” 等指令词。每个词都告诉你需要展示多少步骤以及答案的形式。例如 “calculate” 要求写出方法并给出精确或适当舍入的答案，而 “describe” 要求说明图形或数据集表现出的趋势、形状或特征。

You should underline the command word and any key conditions in the question. This prevents you from calculating when the examiner asks for a comparison, or describing when the examiner asks for a calculation. Misreading the command word is one of the most common causes of lost marks.

你应在题目中圈出指令词和关键条件。这样可以避免把比较题答成计算题，或把计算题答成描述题。误读指令词是丢分最常见的原因之一。

Questions that say “state” or “write down” require no working and often carry only a quick mark. Questions that say “show that” require every step so the examiner can follow your reasoning. Adjust the detail of your answer to the command word used.

题目中出现 “state” 或 “write down” 时通常不需要步骤，且分值较低。出现 “show that” 时则要求写出每一个步骤，以便考官理解你的推理过程。要根据指令词调整答案的详细程度。

2. How Marks Are Awarded: M, A, B and CAO | 评分方式：方法分、准确分与独立分

In a Cambridge IGCSE Statistics mark scheme, marks are usually split into method marks (M), accuracy marks (A) and independent marks (B). Method marks are earned for using a correct process, even if the final answer is wrong. Accuracy marks require the correct answer or a correct answer following an earlier error.

在剑桥 IGCSE 统计评分标准中，分数通常分为方法分（M）、准确分（A）和独立分（B）。方法分是对正确解题过程的奖励，即使最终答案错误也可获得。准确分要求答案正确，或在前一步错误后仍能正确继续得到的答案。

Some marks are labelled “cao”, meaning correct answer only. “ft” means follow through: if you use an earlier incorrect value in a correct way, you can still receive the mark. “oe” means or equivalent, “SC” means special case, and “isw” means ignore subsequent working. Knowing these codes helps you understand why some partially correct answers still score.

有些分数标注为 “cao”，意思是只认可正确答案。”ft” 表示跟随错误：如果你用前一步的错误数值但方法正确，仍可获得该分。”oe” 表示或等价答案，”SC” 表示特殊情况，”isw” 表示忽略后续多余步骤。了解这些代码有助于你明白为什么有些部分正确的答案仍然得分。

Common mark code table:

常用评分代码表：