📚 Experimental/Practical Assessment Key Points | 实验/实践考核要点
Psychology is the scientific study of mind and behaviour, and at the heart of this science lies the experiment. In your Year 9 SQA course, practical assessments are designed to test not just what you know, but how well you can think like a psychologist. You will plan, carry out, and evaluate a simple piece of research, and the key to success is understanding the core principles that turn a good idea into a sound investigation.
心理学是对心理和行为的科学研究，而实验正是这门科学的核心。在九年级 SQA 课程中，实践考核不仅测试你掌握了多少知识，更看重你是否能像心理学家一样思考。你需要计划、实施并评估一项简单的研究，而成功的关键在于理解那些将好想法转变为可靠实验的核心原则。
1. Understanding the Scientific Method | 理解科学方法
The scientific method is a systematic process used to test ideas and build knowledge. In a practical assessment, you must show you can move logically from a research question to a testable hypothesis, and then to data collection and analysis. A hypothesis is a precise, testable prediction about the relationship between variables. It is never a guess but an informed statement grounded in previous research or theory.
科学方法是一个用来检验想法并构建知识的系统化流程。在实践考核中，你必须展示你能从研究问题出发，逻辑地推导出可验证的假设，再进行数据收集与分析。假设是对变量之间关系的一种精确、可检验的预测。它绝不是瞎猜，而是基于以往研究或理论的有根有据的陈述。
Every experiment starts with an aim – a general statement of what you intend to investigate. This is followed by the hypothesis. For SQA assessments, you will often use an alternative hypothesis (predicting an effect or difference) and a null hypothesis (predicting no effect or difference). You do not need to conduct statistical tests at this stage, but you should know what a null hypothesis represents.
每个实验都始于一个目的——对你打算研究的内容做一个总体陈述。接着就是假设。在 SQA 考核中，你通常会用到备择假设（预测存在效应或差异）和零假设（预测无效应或差异）。现阶段你不需要进行统计检验，但你应该明白零假设代表什么。
2. Independent and Dependent Variables | 自变量与因变量
In any psychology experiment, you manipulate one variable to see its effect on another. The variable you change is the independent variable (IV), and the variable you measure is the dependent variable (DV). A simple example: if you want to test whether background music affects memory, the IV could be 'type of music' (with conditions like pop, classical, or silence), and the DV would be 'memory score' on a word recall test.
在任何心理学实验中，你都要操控一个变量来观察它对另一个变量的影响。你所改变的那个变量是自变量（IV），你所测量的那个变量是因变量（DV）。举个简单的例子：如果你想测试背景音乐是否影响记忆，自变量可以是“音乐类型”（分为流行乐、古典乐或安静环境），因变量则是词语回忆测试中的“记忆得分”。
When writing up your practical, you must clearly identify your IV and DV in both the aim and the hypothesis. Examiners look for precise wording. For instance, 'to see if music affects memory' is too vague; you need to specify exactly what aspect of music and what measure of memory. The more operationalised your variables, the stronger your experimental design.
在撰写实验报告时，你必须在目的和假设中都清晰标明自变量和因变量。考官会留意用词的精确性。例如，“探究音乐是否影响记忆”过于模糊；你需要明确指出音乐的具体方面以及记忆的测量方式。变量的操作性定义越清晰，你的实验设计就越严谨。
3. Operationalising Variables | 变量的操作性定义
Operationalisation means defining your variables in terms of the exact procedures you will use to measure or manipulate them. This makes your experiment replicable. For example, instead of saying 'measuring happiness', you operationalise it as 'the score on a 10-point happiness scale after watching a comedy clip'. This turns an abstract concept into something concrete that can be recorded.
操作性定义意味着用你将用于测量或操控变量的具体程序来定义这些变量。这使你的实验具有可重复性。例如，与其说“测量幸福感”，不如将其操作性定义为“观看喜剧片段后在10点幸福感量表上的得分”。这样就把一个抽象概念转化为可以记录的具体事物。
In SQA practicals, operationalisation also extends to the conditions of the IV. If your IV is 'noise level', you must state exactly what decibel levels you used, how they were produced, and for how long. Weak operationalisation is a common reason for lost marks. Always ask: could someone else repeat my study exactly just by reading my plan?
在 SQA 实践中，操作性定义还涉及自变量的各个条件。如果你的自变量是“噪音水平”，你必须明确说明你使用的具体分贝数值、噪音是如何产生的、持续多长时间。操作性定义薄弱是常见的失分原因。你始终要自问：别人仅凭阅读我的计划就能精确重复我的研究吗？
4. Experimental Design Types | 实验设计类型
There are three main ways to allocate participants to conditions: independent groups, repeated measures, and matched pairs. In an independent groups design, different participants experience each condition. This avoids order effects but requires more participants and is vulnerable to individual differences. In a repeated measures design, the same participants take part in all conditions. This controls for participant variables but can lead to order effects such as practice or fatigue.
将参与者分配到不同实验条件主要有三种方式：独立组设计、重复测量设计和匹配对设计。在独立组设计中，不同的参与者经历不同的条件。这避免了顺序效应，但需要更多的参与者，且容易受到个体差异的影响。在重复测量设计中，同一批参与者经历所有条件。这控制了参与者变量，但可能产生练习效应或疲劳效应等顺序效应。
The third design, matched pairs, involves pairing participants on a key characteristic (e.g., memory ability) and then randomly assigning each member of the pair to a different condition. This is a strong design but can be time-consuming. For your practical, you need to name your design, describe how you implemented it, and justify why it was suitable. You must also identify one strength and one limitation of your chosen design.
第三种设计是匹配对设计，先根据某个关键特征（如记忆能力）将参与者配对，然后将每对中的两人随机分配到不同的条件。这是一个很好的设计，但可能非常耗时。在你的实践作业中，你需要说出你采用的设计名称，描述你是如何实施的，并论证它为什么合适。你还必须指认你选择的设计的一个优点和一个局限性。
5. Controlling Extraneous Variables | 控制额外变量
An extraneous variable is any factor, other than the IV, that could influence the DV. If not controlled, it becomes a confounding variable, ruining the internal validity of your experiment. Common extraneous variables include environmental distractions (noise, light), participant characteristics (age, motivation), and experimenter effects (unintentional cues). You must identify potential extraneous variables and describe how you controlled them.
额外变量是指除自变量之外任何可能影响因变量的因素。如果没有加以控制，它就会成为混淆变量，破坏你实验的内部效度。常见的额外变量包括环境干扰（噪音、光线）、参与者特征（年龄、动机）以及实验者效应（无意间的暗示）。你必须识别潜在的额外变量，并说明你是如何控制它们的。
Standardised procedures are your best tool for control. This means writing exact instructions that are read to every participant, using the same materials, and keeping the timing constant. For example, if you are testing reaction time, you would use the same device, the same display brightness, and the same seating position for all participants. Any variation must be minimised.
标准化程序是你控制额外变量的最佳工具。这意味着你要写下精确的指导语，对每位参与者朗读相同的内容，使用相同的材料，并保持时间一致。例如，如果你在测试反应时间，你应当为所有参与者使用相同的设备、相同的屏幕亮度和相同的坐姿。任何差异都必须降到最低。
6. Ethical Considerations | 伦理考量
Even in a simple classroom experiment, ethical principles must be followed. Participants have the right to give informed consent: they should know what they are agreeing to do before they start. For school-based research, you often obtain consent from a teacher or use a simplified information sheet. You must never pressure anyone to take part; participation must be voluntary.
即便是在简单的课堂实验中，也必须遵守伦理原则。参与者有权给予知情同意：他们在开始之前应该知道自己同意做什么。对于学校研究，你通常会从老师那里获得许可，或者使用一份简化的知情同意书。你绝不能强迫任何人参加；参与必须是自愿的。
Other key ethical issues include the right to withdraw (participants can leave at any time without penalty), confidentiality (names are not shared, data is anonymised), and protection from harm (no physical or psychological distress). After the study, you should debrief participants, explaining the true purpose of the experiment and answering any questions. Failing to mention ethics in your practical write-up is a serious omission.
其他关键的伦理问题包括退出权（参与者可以随时离开而不受惩罚）、保密性（不公开姓名，数据匿名处理）以及免受伤害（不造成身体或心理上的痛苦）。研究结束后，你应该对参与者进行事后解释，说明实验的真实目的并回答任何疑问。在实践报告中遗漏伦理问题是严重的疏忽。
7. Data Collection Methods | 数据收集方法
You can collect data in various ways, but for a typical Year 9 SQA practical, you will most likely use self-report measures (questionnaires, rating scales) or direct observation of behaviour. A well-designed rating scale, for example, can measure anxiety on a 1–10 Likert scale, providing numerical data that can be averaged and compared across conditions.
你可以通过多种方式收集数据，但在典型的九年级 SQA 实践中，你极有可能会使用自我报告测量（问卷、评定量表）或对行为的直接观察。例如，一个设计良好的评定量表可以用 1–10 的李克特量表来测量焦虑，提供可以计算平均值并在不同条件间进行比较的数值型数据。
When using observational methods, you must decide between structured or unstructured observation, and whether you will record behaviour in real time or from video. Behavioural categories need to be clearly defined to ensure consistency. For instance, if measuring 'aggression', you might count specific actions like 'hitting' or 'shouting', but not vague impressions. All decisions must be recorded in your method section.
在使用观察法时，你必须决定是采用结构化观察还是非结构化观察，以及是实时记录行为还是通过视频记录。行为类别需要明确定义以确保一致性。例如，如果测量“攻击性”，你可以计数“击打”或“喊叫”等具体动作，而不是模糊的印象。所有决策都必须记录在你的方法部分中。
8. Presenting and Analysing Data | 数据展示与分析
Your raw data must be organised into a clear table. Typically, you will calculate measures of central tendency – the mean, median, and mode. The mean is the most common average but is sensitive to extreme scores; the median is the middle value and is less affected by outliers. Knowing which measure to use and why demonstrates good analytical thinking.
你的原始数据必须整理成清晰的表格。通常，你会计算集中趋势的度量——平均数、中位数和众数。平均数是最常用的均值，但对极端分数敏感；中位数是中间值，受异常值影响较小。知道该用哪个度量并说明原因，能展现出良好的分析思维。
You might also produce a bar chart or a line graph to visually compare conditions. All graphs must have a title, labelled axes, and a consistent scale. At this level, you are not expected to run inferential statistics, but you should comment on the patterns in the data. Do the results appear to support the hypothesis? Are there any unexpected findings?
你可能还需要绘制条形图或折线图来直观比较不同条件。所有图表都必须有标题、标注过的坐标轴和一致的刻度。在这个阶段，你不需要进行推断统计分析，但你应该对数据的模式进行评论。结果看起来支持假设吗？是否有任何意外的发现？
9. Drawing Conclusions and Evaluating | 得出结论与评价
A conclusion must directly address the hypothesis. Start by stating whether the results support or refute your alternative hypothesis, and then relate this finding back to the psychological theory or model you introduced in your introduction. Avoid overclaiming: you cannot say 'music improves memory' for all people; you can only say that under these specific conditions, your participants' memory scores were higher with classical music.
结论必须直接回应假设。首先要说明你的结果支持还是否定了你的备择假设，然后将这一发现与你引言中介绍过的心理学理论或模型联系起来。避免夸大其词：你不能说“音乐能提高所有人的记忆力”；你只能说在这些特定条件下，你的参与者的记忆得分在古典音乐下更高。
Evaluation is where you critically reflect on your study. Discuss two or three strengths (e.g., good control of extraneous variables, standardised procedure) and two or three limitations (e.g., small sample size, artificial task). For each limitation, suggest a realistic improvement. This 'strength-weakness-improvement' structure is highly rewarded in SQA marking.
评价部分需要你对自己的研究进行批判性反思。讨论两到三个优点（如额外变量控制良好、程序标准化）和两到三个局限性（如样本量小、任务人工化）。对每个局限性，都要提出一个切实可行的改进建议。这种“优点-不足-改进”的结构在 SQA 评分中会受到高度认可。
10. Writing a Lab Report | 撰写实验报告
Your practical assessment is usually submitted as a written report with standard sections. A typical structure includes: Title, Introduction (including aim and hypothesis), Method (design, participants, apparatus, procedure), Results (tables and graphs), Discussion (conclusion, evaluation), and References. Adhering to this order shows you understand the conventions of psychological research.
你的实践考核通常以书面报告的形式提交，它包含标准的部分。典型的报告结构包括：标题、引言（包括目的和假设）、方法（设计、参与者、仪器/材料、程序）、结果（表格和图表）、讨论（结论、评价）以及参考文献。遵循这个顺序表明你理解心理学研究的惯例。
Within the Method section, be precise and write in the passive voice where appropriate (e.g., 'Participants were asked to...' rather than 'I asked participants to...'). This maintains an objective tone. In the Results section, do not explain why the data turned out as it did; save interpretation for the Discussion. Finally, always include a reference for any theory or study you cited. A consistent and tidy report reflects a disciplined scientific attitude.
在方法部分，要写得精确，并在适当的地方使用被动语态（例如“参与者被要求……”而非“我要求参与者……”）。这能保持客观的语气。在结果部分，不要解释数据为什么是这样；把解读留到讨论部分。最后，务必为你引用过的任何理论或研究附上参考文献。一份格式统一、整洁的报告反映出了严谨的科学态度。
Published by TutorHao | Psychology Revision Series | aleveler.com
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