📚 Year 9 WJEC Psychology: Key Points for Experimental/Practical Assessment | 九年级 WJEC 心理学：实验/实践考核要点
Welcome to your guide for mastering the experimental and practical assessment in Year 9 WJEC Psychology. This article will walk you through the essential knowledge and skills you need to plan, carry out, analyse and evaluate your own simple experiments. Whether you are designing a memory test, investigating helping behaviour or testing reaction times, these key points will help you achieve more confident marks.
欢迎阅读九年级 WJEC 心理学实验与实践考核要点指南。本文将带你逐一梳理计划、实施、分析和评价简单实验所需的核心知识与技能。无论你是在设计记忆测试、调查助人行为还是测试反应时间，这些要点都能帮助你更自信地拿分。
1. The Scientific Approach in Psychology | 心理学的科学方法
Psychology is not just about opinions; it relies on scientific methods to gather evidence. In your practical, you will follow a structured process: define a question, propose a hypothesis, design a procedure, collect data and draw conclusions.
心理学不只是发表观点，它依赖科学方法来收集证据。在你的实践考核中，你会遵循一套清晰的流程：确定问题、提出假设、设计程序、收集数据并得出结论。
All experiments aim to establish cause and effect between two variables. The key is to change one thing and measure any effect on another while keeping everything else the same.
所有实验的目的都是确定两个变量之间的因果关系。关键就在于改变一件事，测量它对另一件事的影响，同时让其他一切保持不变。
This scientific mindset means you must be objective. You should not let personal beliefs influence your measurements or conclusions. Your report should be clear enough for someone else to replicate the study.
这种科学思维意味着你必须保持客观。不能让个人信念影响你的测量或结论。你的报告必须足够清晰，让他人也能够重复研究。
2. Formulating a Testable Hypothesis | 制定可检验的假设
Before you lift a finger, you need a precise, testable statement predicting what you think will happen. This is your hypothesis. For Year 9 practicals, you will usually write an experimental (alternative) hypothesis and a null hypothesis.
在你动手之前，需要用一句精确、可检验的陈述来预测你认为会发生什么，这就是你的假设。九年级的实践中，你通常需要写出一个实验假设（备择假设）和一个虚无假设。
An experimental hypothesis might be: 'Participants who listen to music will recall fewer words from a list than participants who work in silence.' It is directional because it predicts the direction of the difference.
实验假设可以是：“听音乐的参与者比在安静环境中工作的参与者回忆起的单词更少。”这是一个方向性假设，因为它预测了差异的方向。
The null hypothesis simply states there will be no difference (or no effect): 'There will be no difference in recall between participants who listen to music and those who work in silence, and any difference is due to chance.'
虚无假设则声明没有差异（或没有效应）：“听音乐的参与者与安静工作的参与者在回忆上无差异，任何差异都是偶然造成的。”
Make your hypothesis operationalised. That means you specify exactly how the variables will be measured. For instance, 'recall' is measured by the number of words correctly written down after a 2-minute delay.
要把你的假设操作化。也就是说，要准确说明变量将如何测量。例如，“回忆”是通过在 2 分钟延迟后正确写下的单词数量来测量的。
3. Identifying Variables: IV, DV and CV | 识别变量：自变量、因变量与控制变量
Every experiment manipulates one variable and measures another. The variable you deliberately change is the independent variable (IV). The variable you measure to see the effect is the dependent variable (DV).
每一个实验都操纵一个变量并测量另一个变量。你故意改变的变量就是自变量（IV）。你为了观察效果而测量的变量就是因变量（DV）。
In the music and memory experiment, the IV is whether participants listen to music or work in silence. The DV is the number of words correctly recalled. All other factors, such as the time of day, the list of words and the room conditions, must be controlled. They become control variables (CVs).
在音乐与记忆的实验中，IV 是参与者是否听音乐或处于安静状态。DV 是正确回忆的单词数量。其他所有因素，如一天中的时间、单词列表和房间条件，都必须加以控制，它们成为控制变量（CV）。
Why are control variables so crucial? Because if you do not keep them constant, they could become confounding variables that confuse your results. For example, if the 'music' group tested in a noisy corridor and the 'silent' group tested in a library, the setting alone might explain the difference in recall.
为什么控制变量如此关键？因为如果你不把它们保持不变，它们就可能变成混淆变量，干扰你的结果。例如，如果“音乐”组在嘈杂的走廊里测试，而“安静”组在图书馆里测试，仅环境本身就可能解释回忆的差异。
When writing your practical report, always list at least three control variables you kept consistent, such as age of participants, type of word list and instructions given.
在撰写实践报告时，务必列出至少三个你保持恒定的控制变量，例如参与者的年龄、单词列表的类型和所给的指导语。
4. Choosing an Experimental Design | 选择实验设计
Experimental design refers to how you allocate participants to the different conditions of your IV. The three main designs you need to know are independent groups, repeated measures and matched pairs.
实验设计指的是你如何把参与者分配到不同的 IV 条件中。你需要了解的三种主要设计是：独立组、重复测量和配对组。
| Design | How it works | Strength | Weakness |
|---|---|---|---|
| Independent Groups | Different participants in each condition | No order effects (no practice or boredom) | Participant variables (individual differences) may differ between groups |
| Repeated Measures | Same participants do all conditions | Participant variables are controlled | Order effects – practice or fatigue can affect performance |
| Matched Pairs | Different but similar participants are paired on key traits | Reduces participant variables without order effects | Time-consuming and difficult to match perfectly |
In Year 9, independent groups and repeated measures are the most common designs you will use. When you choose a design, you must justify your choice and explain how you will deal with its weaknesses. For example, if using repeated measures, you might use counterbalancing – half the participants do condition A then B, the other half do B then A.
九年级阶段，独立组和重复测量是你最常用的设计。选择一种设计后，你必须为你的选择提供理由，并说明如何应对它的弱点。例如，如果使用重复测量，你可以采用抵消平衡法——一半参与者先做条件 A 再做 B，另一半先做 B 再做 A。
5. Sampling Participants | 抽样与参与者
A sample is the group of people who take part in your study. The way you choose them is called a sampling method. For your practical, you might use an opportunity sample, a volunteer sample or a random sample.
样本是参与你研究的一组人，你选择他们的方式叫做抽样方法。在你的实践中，你可能会使用机会样本、志愿者样本或随机样本。
An opportunity sample involves asking anyone who is nearby and willing, like classmates. It is quick and easy but may be biased because these people might share similar characteristics.
机会样本就是问附近任何愿意参与的人，比如同班同学。它快捷简单，但可能带有偏见，因为这些人可能有相似的特征。
A volunteer sample is when people actively choose to take part after seeing an advertisement. This can attract a more diverse group but might bring in a certain type of person – those who are particularly keen or helpful.
志愿者样本是人们看到广告后主动选择参与。这可能吸引更广泛的人群，但也可能只引来特定类型的人——那些特别热心或爱帮忙的人。
In a random sample, every member of the target population has an equal chance of being selected, such as drawing names from a hat. This is the best way to avoid bias, but it is often impractical for a Year 9 classroom experiment. In your report, state clearly which method you used and evaluate why it might affect your results.
在随机样本中，目标群体中的每个人都有同等被选中的机会，比如从帽子里抽名字。这是避免偏差的最佳方式，但在九年级的课堂实验中往往不现实。在你的报告中，要清楚地说明你使用了哪种方法，并评价它可能怎样影响你的结果。
6. Ethical Guidelines for Experiments | 实验的伦理指南
Whenever you work with human participants, you must follow ethical principles. The British Psychological Society (BPS) sets out key guidelines that you must refer to in your practical work.
每当你与人类参与者打交道时，都必须遵守伦理原则。英国心理学会（BPS）制定了一些关键指南，你在实践工作中必须参考。
First, you must obtain informed consent. Participants should know what the study is about and agree to take part. In Year 9, you can give them a simple information sheet and a consent form. If they are under 16, you may also need parental consent.
首先，你必须获得知情同意。参与者应当知道研究是关于什么的并同意参与。九年级时，你可以给他们一份简单的信息说明和一份同意书。如果他们未满 16 岁，可能还需要父母同意。
You must also protect participants from harm. This could mean avoiding embarrassing tasks or ensuring they do not feel stressed. Right to withdraw must be made clear: anyone can leave the study at any time without giving a reason.
你还必须保护参与者免受伤害。这可能意味着避免令人尴尬的任务或确保他们不感到压力。必须明确告知退出的权利：任何人都可以随时退出研究而无需给出理由。
Deception should be avoided where possible. If you must use mild deception, you need to debrief participants afterwards, explaining the true purpose of the experiment. Finally, confidentiality must be maintained – use participant numbers instead of names.
应尽可能避免欺骗。如果必须使用轻微的欺骗，事后你需要对参与者进行事后解释，说明实验的真实目的。最后，必须保密——用编号代替姓名。
Even for a small practical, check off these principles. They show you are a responsible researcher.
即使是小规模实践，也要逐一检查这些原则。这能表明你是一个负责任的研究者。
7. Collecting Data: Observation and Questionnaires | 收集数据：观察与问卷
Your experiment might use a questionnaire or an observation checklist to gather data. Both are systematic ways of recording information.
你的实验可能会使用问卷或观察清单来收集数据。两者都是记录信息的系统化方式。
Questionnaires can include closed questions (yes/no, Likert scales) for easy counting or open questions for richer detail. For the memory experiment, a simple recall sheet that asks participants to write remembered words is a form of questionnaire.
问卷可以包含封闭式问题（是/否、李克特量表）以便于计数，或开放式问题以获取更丰富的细节。对于记忆实验，一张简单的回忆用纸让参与者写下记住的单词，就是一种问卷形式。
If you are observing behaviour, you need a structured observation schedule. For instance, if you were counting how many times a person helps someone, you would create a tally chart with predefined categories such as 'offered help', 'walked past' or 'pointed the way'.
如果你在观察行为，就需要一份结构化的观察表。例如，如果你要统计一个人帮助他人的次数，你会创建一个计分表，上面有预设类别，如“提供了帮助”、“走了过去”或“指了路”。
Whatever method you use, you must decide whether your measures are reliable and valid. Reliability means the method gives consistent results; validity means it measures what it claims to measure. In your evaluation, discuss how your questionnaire or observation sheet might be improved.
无论你用什么方法，都必须判断你的测量是否可靠和有效。信度指方法会给出前后一致的结果；效度指它测量了它声称要测量的东西。在你的评估中，要讨论如何改进问卷或观察表。
8. Measuring and Recording Results | 测量与记录结果
Good data recording is the backbone of a successful practical. You should prepare a raw data table before you start testing. This table simply shows the individual scores for each participant in each condition.
良好的数据记录是成功实践的基础。在开始测试前，你应该准备一份原始数据表。这个表格简单地展示每个参与者在每个条件下的个人得分。
For the music and memory experiment, your raw data table might have columns for 'Participant Number', 'Condition (Music/Silent)' and 'Words Recalled'. Always double-check you have not missed any entries.
对于音乐与记忆实验，你的原始数据表可以有这些列：“参与者编号”、“条件（音乐/安静）”和“回忆单词数”。务必仔细核查，不要漏掉任何条目。
After collecting raw data, you will calculate descriptive statistics. The most common ones in Year 9 are the mean, median, mode and range. The mean (average) is the sum of all scores divided by the number of scores. The median is the middle value when scores are ordered. The mode is the most frequent score. The range shows the spread between the highest and lowest scores.
收集原始数据后，你将计算描述统计量。九年级最常见的是平均数、中位数、众数和极差。平均数（均值）是所有分数之和除以分数的个数。中位数是将分数排序后中间的那个值。众数是出现最频繁的分数。极差则显示最高分与最低分之间的跨度。
Mean x̄ = Σx ÷ n
Always show your calculations in your report. Organise these statistics in a summary table so the examiner can quickly see the patterns in your data.
报告中务必展示你的计算过程。把这些统计量整理到一张汇总表中，考官就能快速看出数据中的规律。
9. Presenting Data: Tables and Graphs | 呈现数据：表格与图表
Once you have your summary statistics, you need to present them visually. Bar charts are ideal for comparing the mean scores of two or more conditions. Remember to label both axes clearly: the x-axis shows the IV conditions and the y-axis shows the mean DV.
有了汇总统计量后，你需要把它们直观地呈现出来。条形图非常适合比较两种或多种条件的平均分数。记得给两条坐标轴都清楚地标记：x 轴展示 IV 条件，y 轴展示 DV 平均值。
Give your graph a clear title, for example: 'Bar chart showing mean number of words recalled in music and silent conditions'. Bars should be drawn accurately to scale and should not touch each other.
给你的图表一个清晰的标题，例如：“条形图展示音乐和安静条件下回忆单词的平均数量”。条形要按比例准确绘制，且彼此之间不应接触。
If your data is continuous, you might use a line graph or a histogram. But for most Year 9 experiments with two distinct conditions, a bar chart is the best choice. You can also present data in a well-structured table with proper headings and units.
如果你的数据是连续的，你可能会使用折线图或直方图。但对于九年级大多数有两个清晰条件的实验，条形图是最佳选择。你也可以用结构良好的表格呈现数据，加上适当的标题和单位。
Always write a short paragraph under your graph describing what it shows. Do not interpret yet; just describe the trend: 'The bar chart shows that the silent condition had a higher mean words recalled (12.5) than the music condition (8.3).'
务必在图表下方写一小段话，描述它所展示的内容。此时不要解释，只需描述趋势：“条形图显示，安静条件下回忆单词的平均数（12.5）高于音乐条件（8.3）。”
10. Evaluating Your Experiment | 评估你的实验
An excellent practical report ends with a thoughtful evaluation. This is where you discuss strengths, limitations and suggest improvements. You must link your comments directly to your own procedure and results.
一份优秀的实践报告以深思熟虑的评估收尾。你要在这里讨论优点、局限性并提出改进建议。你的评论必须直接联系到你自己的程序和结果。
Start by stating whether your hypothesis was supported. Do not say 'proved'; say 'the results support the experimental hypothesis'. Then consider issues: Were there any uncontrolled variables? Did the sample size limit how confident you can be? Was the measure of the DV accurate enough?
先说明你的假设是否得到支持。不要说“证明了”，而要说“结果支持了实验假设”。然后考虑问题：是否存在未控制的变量？样本量是否限制了你得出结论的信心？对 DV 的测量足够准确吗？
For example, you might note that the word list might have been easier for some participants because of their prior knowledge, or that noise from the corridor affected the silent condition. Suggest realistic improvements, such as testing participants in separate, soundproof rooms, or using a longer word list to make the task more sensitive.
例如，你可能注意到单词列表对某些参与者可能更容易，因为他们有相关知识，或者走廊的噪音影响了安静条件的情况。提出切实可行的改进建议，比如在独立的隔音房间里测试参与者，或使用更长的单词列表让任务更敏感。
You should also reflect on the broader implications: can your findings relate to real-life situations, such as studying with background music? But be cautious – never generalise beyond what your small-scale study can truly support.
你还应反思更广泛的意义：你的发现能否联系到现实情境，比如在有背景音乐的情况下学习？但要谨慎——永远不要做出超出你这个小规模研究真正能支持的过度推广。
Finally, comment on the validity and reliability of your own measures. This shows you understand how psychology works as a discipline.
最后，对自己测量的有效性和可靠性加以评论。这表明你理解心理学作为一门学科是如何运作的。
Published by TutorHao | Psychology Revision Series | aleveler.com
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