IGCSE CAIE Psychology: Experimental and Practical Assessment Essentials | IGCSE CAIE 心理学：实验/实践考核要点

📚 IGCSE CAIE Psychology: Experimental and Practical Assessment Essentials | IGCSE CAIE 心理学：实验/实践考核要点

In CAIE IGCSE Psychology (0471), practical and experimental skills are assessed through written questions rather than a laboratory practical paper. You are expected to apply research methods to novel scenarios, evaluate studies, and interpret data. Success depends on precision with terminology, procedural controls, and ethical reasoning.

在 CAIE IGCSE 心理学(0471)中，实践与实验技能通过纸笔试题而非实验室实操卷来考查。你需要把研究方法应用到新情境、评价研究并解释数据。能否准确使用术语、说明程序控制和伦理推理，直接影响得分。

1. Know Where Practical Skills Are Assessed | 明确实验/实践技能在哪里考查

The IGCSE Psychology syllabus does not include a separate practical workbook or lab examination. Instead, research methods and experimental design appear mainly in Paper 2, where short-answer and essay questions may present a study, ask you to identify variables, suggest controls, or evaluate the procedure.

IGCSE 心理学大纲不设单独的实践记录本或实验室考试；研究方法与实验设计主要出现在 Paper 2，其中的简答与论文题会给出一个研究情境，要求你识别变量、提出控制方法或评价程序。

Treat every research scenario as a mini-experiment. Read the stem carefully, highlight the aim, sample, procedure, and results before answering. Marks are awarded for using psychological terminology accurately.

把每个研究情境都当作一个小实验。答题前仔细阅读题干，圈出研究目的、样本、程序和结果；准确使用心理学术语才能得分。

2. Writing Aims and Hypotheses | 撰写研究目的与假设

An aim states the purpose of the study in broad terms, such as ‘to investigate whether music affects memory’. A hypothesis must be a precise, testable prediction stating the expected effect of the independent variable on the dependent variable.

研究目的(aim)以概括性语言说明研究意图，如”探究音乐是否影响记忆”。假设(hypothesis)必须是精确、可检验的预测，说明自变量对因变量的预期影响。

For the CAIE exam, you should be able to write an experimental hypothesis and a null hypothesis. A one-tailed hypothesis predicts a direction (e.g. ‘music improves recall’), while a two-tailed hypothesis does not (e.g. ‘music affects recall’).

在 CAIE 考试中，你需要会写实验假设和零假设(null hypothesis)。单尾假设预测方向(如”音乐提高回忆成绩”)，双尾假设不预测方向(如”音乐影响回忆成绩”)。

Always include the IV and DV in the hypothesis, and operationalise them. For example: ‘Participants who listen to instrumental music during encoding will recall more words from a 20-word list than participants who encode in silence.’

假设中必须包含自变量和因变量，并加以操作化。例如：”编码阶段听器乐音乐的参与者，对 20 个单词列表的回忆数量将多于在安静环境下编码的参与者。”

3. Identifying Independent and Dependent Variables | 识别自变量与因变量

The independent variable (IV) is the factor manipulated by the researcher or compared between conditions. The dependent variable (DV) is the outcome measured. In an experiment on music and memory, the IV is presence or absence of music; the DV is number of words correctly recalled.

自变量(IV)是研究者操纵或在不同条件间比较的因素；因变量(DV)是测量的结果。在音乐与记忆的实验中，自变量是是否有音乐，因变量是正确回忆的单词数。

Operationalisation means defining variables so they can be manipulated or measured objectively. Avoid vague phrases such as ‘memory’ or ‘happiness’; instead say ‘number of words recalled from a 20-item list’ or ‘score on the Positive Affect Scale from 1 to 10’. This makes a study replicable.

操作化(operationalisation)是指对变量下可客观操纵或测量的定义。避免使用”记忆””快乐”等模糊表述，而应写”20 词表中正确回忆的词数”或”积极情绪量表 1-10 分”。这样研究才可重复。

4. Controlling Extraneous and Confounding Variables | 控制额外变量与混淆变量

Extraneous variables are any factors other than the IV that could affect the DV, such as noise, time of day, or participant mood. A confounding variable is an extraneous variable that varies systematically with the IV, making it impossible to separate their effects.

额外变量(extraneous variables)是除自变量外可能影响因变量的任何因素，如噪音、时间或参与者情绪。混淆变量(confounding variable)是与自变量一同系统变化的额外变量，导致无法区分它们的作用。

Standardised instructions, controlled room conditions, and use of identical materials reduce extraneous variables. Random allocation to conditions helps prevent participant differences from becoming confounds.

标准化指导语、控制房间条件、使用相同材料可减少额外变量；随机分配参与者到不同条件，可防止参与者差异变成混淆变量。

In repeated measures designs, order effects can act as confounds. Counterbalancing (half participants do condition A then B, half do B then A) controls this.

在重复测量设计中，顺序效应可能成为混淆变量；采用抵消平衡(counterbalancing，即一半参与者先做 A 后做 B，另一半先做 B 后做 A)可以控制。

5. Experimental Designs: Independent Groups, Repeated Measures, Matched Pairs | 实验设计：独立组、重复测量、匹配对

In an independent groups design, different participants take part in each condition. This avoids order effects but can suffer from participant variables because individuals differ between groups.

独立组设计(independent groups)中，不同参与者进入不同条件；这避免了顺序效应，但容易受参与者变量影响，因为组间个体不同。

In a repeated measures

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