📚 A-Level CAIE Statistics: Answering Techniques and Marking Criteria | A-Level CAIE 统计：答题技巧与评分标准
In CAIE A-Level Statistics papers (9709/5 and 9709/6, or the Statistics route), marks are awarded not only for final answers but for correct methods, notation, and interpretation. This guide explains how examiners allocate marks and how to maximise your score under exam pressure.
在 CAIE A-Level 统计考试（9709/5 和 9709/6，或统计方向）中，分数不仅给最终答案，还给正确的方法、符号和解释。本指南说明考官如何给分，以及如何在考试压力下最大化得分。
1. Understanding CAIE Statistics Papers and Command Words | 了解CAIE统计试卷与指令词
CAIE Statistics questions often contain command words such as 'State', 'Find', 'Calculate', 'Show that', 'Comment', and 'Determine whether'. Each command word signals a different marking logic: 'State' usually requires a single accuracy mark, while 'Show that' demands a clear chain of reasoning leading to the given result.
CAIE 统计题常包含指令词，如 State（写出）、Find（求）、Calculate（计算）、Show that（证明）、Comment（评价）和 Determine whether（判断是否）。每个指令词对应不同的给分逻辑：State 通常只需一个准确答案分，而 Show that 要求清晰的推理链得出给定结果。
Before answering, underline the command word and check the mark allocation. If a question is worth 3 marks, you are expected to produce at least three distinct pieces of evidence, such as setting up a distribution, substituting into a formula, and giving a conclusion.
作答前，划出指令词并检查分值。如果一道题 3 分，你至少需要写出三个独立的得分点，例如设定分布、代入公式、给出结论。
The table below summarises the most common command words and their mark focus.
下表总结了最常见的指令词及其给分重点。
| Command word | 中文 | Typical mark focus |
|---|---|---|
| State / Write down | 写出 | B or A mark for correct value |
| Find / Calculate | 求 / 计算 | M + A marks for method and answer |
| Show that | 证明 | M marks for derivation, no credit for reverse working |
| Comment / Compare | 评价 / 比较 | A marks for contextual statement |
2. Show Full Working for Method Marks | 展示完整步骤以获取方法分
CAIE uses M marks for method, A marks for accuracy, and B marks for independent results. If a question asks for a probability from a binomial distribution, writing only '0.312' may earn zero if the examiner cannot see the appropriate model. You must show the formula, substitution, and then the answer.
CAIE 给分分为方法分（M）、准确分（A）和独立分（B）。如果一道题要求二项分布的概率，只写“0.312”可能得零分，因为考官无法看到合适的模型。你必须写出公式、代入、再给答案。
Mark types are abbreviated in the mark scheme as M, A, B, and ft. Understanding them helps you decide which working to write.
评分方案中的分数类型缩写为 M、A、B 和 ft。理解它们有助于你决定写哪些步骤。
| Type | 中文 | What it means |
|---|---|---|
| M | 方法分 | Awarded for a correct method, even if the final answer is wrong |
| A | 准确分 | Awarded for a correct answer following a valid method |
| B | 独立分 | Awarded for a result independent of method, e.g. stating a formula or value |
| ft | 跟随分 | Awarded for a correct follow-through from an earlier error |
For a 'Show that' question, you must not use the given answer in your own working. Instead, derive the expression independently; otherwise method marks may be lost even if the final line is copied correctly.
对 Show that 题，你不能在自己的推导中使用给定答案。相反，要独立推导表达式；否则即使最后一行抄对，方法分也可能丢失。
lues → simplify → state the answer. This makes every M and A mark visible to the examiner.
常用技巧是按纵向流程书写：写出模型 → 写出公式
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