📚 IGCSE Cambridge Statistics: Report Writing Framework and Model Answer | IGCSE 剑桥统计：论文写作框架与范文
In IGCSE Cambridge Statistics, a high-scoring written report or structured data-response answer is not just a collection of correct numbers. It is a logical argument built around a clear aim, appropriate data, sensible calculations, and a conclusion that refers back to the original question.
在 IGCSE 剑桥统计中，高分报告或结构化数据题作答不只是罗列正确答案，而是围绕清晰目的、合适数据、合理计算以及回到原题的结论所构建的逻辑论证。
This article gives a repeatable writing framework, worked model paragraphs, and examiner-focused advice for IGCSE Statistics report or investigation-style questions.
本文为 IGCSE 统计报告或探究类题目提供可复用的写作框架、范文段落和考官视角的建议。
1. Why a Clear Framework Wins Marks | 为什么清晰框架能得分
A clear report structure helps the examiner see your statistical thinking. In IGCSE Statistics, marks are awarded for choosing a suitable sample, drawing an appropriate diagram, calculating a correct average or spread, and explaining the result in context. If these stages are jumbled together, it is easy to lose communication marks.
清晰的报告结构能帮助考官看到你的统计思维。IGCSE 统计的得分点包括选择合适样本、绘制恰当图形、计算正确平均数或离散程度，并结合情境解释结果。如果这些阶段混在一起，很容易丢掉表达分。
The examiner is not marking a literary essay. You should write short, precise statements with numbers, units and comparisons. Each section should lead naturally to the next, from aim to data to analysis to conclusion.
考官评的不是文学性作文，而是简洁准确的表述，要包含数字、单位和比较。每一部分都应当自然衔接，从目的到数据、分析再到结论。
2. The PPDAC Enquiry Cycle | PPDAC 统计探究循环
A useful structure is PPDAC: Problem, Plan, Data, Analysis, Conclusion. Many IGCSE investigations can add an Evaluation at the end, making PPDACE. This cycle helps you avoid jumping straight from raw data to a conclusion.
有用的结构是 PPDAC：问题、计划、数据、分析、结论。许多 IGCSE 探究还会在结尾加上评价，形成 PPDACE。这一循环可以帮助你避免从原始数据直接跳到结论。
| PPDAC stage | Report section | Key question |
|---|---|---|
| Problem 问题 | Aim and hypothesis 目的与假设 | What am I trying to find out? 我要研究什么？ |
| Plan 计划 | Sampling and data collection 抽样与数据收集 | How will I get reliable data? 我如何获得可靠数据？ |
| Data 数据 | Presentation and description 数据展示与描述 | What do the data look like? 数据呈现什么特征？ |
| Analysis 分析 | Averages, spread, comparisons 平均数、离散程度、比较 | What do the statistics show? 统计量说明了什么？ |
| Conclusion 结论 | Interpretation and evaluation 解释与评价 | What is the answer and how reliable is it? 答案是什么，可靠性如何？ |
3. Before Writing: Read the Command Words | 动笔前：读懂指令词
Command words tell you the depth required. ‘State’ needs a short answer; ‘calculate’ needs a method; ‘compare’ needs data quoted; ‘evaluate’ needs a limitation and improvement.
指令词告诉你需要写多深。State 要求简短作答；calculate 要求展示方法；compare 要求引用数据；evaluate 要求说明局限性和改进方法。
| Command word 指令词 | What it asks 它要求什么 | Framework response 框架回应 |
|---|---|---|
| State/Write down 写出 | Short factual answer 简短事实作答 | One value or sentence 一个数值或一句话 |
| Calculate 计算 | Show working 展示计算过程 | Formula, substitution, answer with units 公式、代入、带单位答案 |
| Compare 比较 | Give similarity or difference 说明相同或不同 | Quote medians, IQRs or means 引用中位数、IQR 或平均数 |
| Comment/Interpret 解释 | Explain in context 结合情境解释 | Say what the value means 说明该值的含义 |
| Evaluate 评价 | Give limitations and improvements 给出局限与改进 | Because…, could be improved by… 因为……，可通过……改进 |
4. Section 1: Aim and Hypothesis | 第一部分：目的与假设
Start with a precise aim: ‘To investigate whether …’. Then write a prediction that can be tested, for example ‘I predict that … because …’. A hypothesis should be specific enough to be supported or rejected by data.
开头写出精确目的：“To investigate whether …”，再写一个可检验的预测，例如“I predict that … because …”。假设必须足够具体，能够被数据支持或否定。
A weak aim says ‘I will look at hand spans.’ A strong aim says ‘To investigate whether the median hand span of Year 10 boys is greater than that of Year 10 girls.’
弱目的如“I will look at hand spans”，强目的则写“旨在研究 10 年级男生的手掌宽度中位数是否大于女生”。
In the hypothesis, give a reason. For example: ‘I predict that boys will have a larger median hand span because male growth patterns often produce wider hands.’
在假设中给出理由。例如：“我预测男生的中位数手掌宽度更大，因为男性发育模式通常使手掌更宽。”
5. Section 2: Data Collection and Sampling | 第二部分：数据收集与抽样
State the population, sample size, sampling method
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