📚 AS WJEC Psychology: Key Points for the Experimental / Practical Assessment | AS WJEC 心理学：实验/实践考核要点
The practical assessment in WJEC AS Psychology requires students to plan, conduct, analyse, and evaluate a psychological investigation. Mastering this component demands a solid understanding of research methodology, ethical practice, and statistical analysis. This guide breaks down the essential knowledge and skills needed to succeed in the experimental and practical elements of the course.
在 WJEC AS 心理学课程中，实践考核要求学生规划、实施、分析和评估一项心理学调查研究。要掌握这一部分，需要对研究方法、伦理实践和统计分析有扎实的理解。本指南将详细拆解在实验及实践考核中取得成功所需的核心知识与技能。
1. Understanding the Practical Assessment | 理解实践考核
The practical assessment is embedded in Unit 2: Psychology: Using Psychological Concepts and typically takes the form of a Personal Investigation. You will be required to design and carry out a small-scale study, or to work with given data to demonstrate your ability to apply the research process. This component tests not only your knowledge of methods but also your critical thinking and evaluation skills.
实践考核属于单元二：应用心理学概念的一部分，通常以个人调查研究的形式出现。你需要设计并实施一项小规模研究，或根据给定数据展示自己的研究应用能力。该部分不仅考察你对研究方法的掌握，也检验你的批判性思维与评估技能。
The assessment objectives (AO1, AO2, AO3) are integrated: you must recall methodological concepts (AO1), apply them to novel contexts or your own investigation (AO2), and critically evaluate procedures, ethics, and findings (AO3). Therefore, a well-rounded preparation is key.
考核目标（AO1、AO2、AO3）是整合在一起的：你必须记忆方法学概念（AO1），将其应用到新情境或自己的调查中（AO2），并对程序、伦理和研究结果进行批判性评价（AO3）。因此，全面准备至关重要。
2. Formulating Research Questions and Hypotheses | 确立研究问题与假设
A clear, focused research question forms the foundation of any practical investigation. It should specify the key variables and the population of interest, for example, 'Does listening to music affect concentration in sixth-form students?' From this, you develop testable hypotheses.
清晰、聚焦的研究问题是任何实践调查的基础。它应明确指出关键变量和关注的人群，例如：“听音乐是否影响高中生的注意力？”由此出发，发展出可检验的假设。
An experimental hypothesis (H₁) predicts the effect of the independent variable on the dependent variable. It can be directional (one-tailed), e.g., 'Students who listen to instrumental music will score higher on a concentration test than those who work in silence,' or non-directional (two-tailed), e.g., 'There will be a difference in concentration test scores between students who listen to instrumental music and those who work in silence.' A null hypothesis (H₀) always states there is no effect or difference.
实验假设（H₁）预测自变量对因变量的影响。它可以是有方向的（单尾），如“听器乐的学生在注意力测试中的得分将高于在安静环境中学习的学生”，也可以是无方向的（双尾），如“听器乐的学生与在安静环境中学习的学生在注意力测试得分上存在差异”。零假设（H₀）总是陈述不存在效应或差异。
Hypotheses must be operationalised and falsifiable. Avoid vague terms like 'memory will be better'; instead specify how memory is measured. This precision is essential for designing the procedure and interpreting results.
假设必须具有可操作化和可证伪性。避免使用“记忆力更好”这样的模糊表述，而应明确说明如何测量记忆。这种精确性对设计程序和解释结果至关重要。
3. Operationalising Variables | 变量操作化
Operationalisation means turning abstract concepts into measurable or manipulable variables. The independent variable (IV) is the factor you change or manipulate, and it must have at least two levels or conditions. The dependent variable (DV) is the factor you measure to see the effect of the IV.
操作化是指将抽象概念转化为可测量或可操纵的变量。自变量（IV）是你改变或操纵的因素，它必须至少有两个水平或条件。因变量（DV）是你用来观察自变量效应的测量因素。
For instance, if investigating the effect of caffeine on reaction time, the IV could be 'amount of caffeine consumed' with levels such as 0 mg and 200 mg. The DV could be 'reaction time in milliseconds on a computer-based task'. Clear operationalisation enables replicability and clarifies what exactly is being tested.
例如，如果研究咖啡因对反应时的影响，自变量可以是“咖啡因摄入量”，水平如 0 毫克和 200 毫克。因变量可以是“基于计算机任务的反应时（毫秒）”。清晰的操作化保证了可重复性，并明确了测试的具体内容。
Extraneous variables are any other factors that could affect the DV and must be controlled. If not controlled and they systematically vary with the IV, they become confounding variables, undermining internal validity.
额外变量是任何可能影响因变量的其他因素，必须加以控制。如果未受控制且它们与自变量系统性地共变，就会成为混淆变量，损害内部效度。
4. Experimental Designs | 实验设计
WJEC AS candidates must be familiar with three main experimental designs: independent groups, repeated measures, and matched pairs. Each design handles participants differently and has distinct strengths and limitations.
WJEC AS 考生必须熟悉三种主要的实验设计：独立组设计、重复测量设计和配对设计。每种设计处理被试的方式不同，有着各自的优点与局限。
The table below summarises the key features of each design:
下表总结了每种设计的关键特征：
| Design | How Participants Are Used | Key Advantage | Key Limitation |
|---|---|---|---|
| Independent Groups | Different participants in each condition of the IV | Avoids order effects (e.g., practice, fatigue) | Participant variables may confound results; needs more participants |
| Repeated Measures | Same participants used in all conditions | Controls for participant variables; fewer participants required | Order effects are a threat; demand characteristics may arise |
| Matched Pairs | Different but matched participants across conditions (matched on relevant traits) | Reduces participant variables without order effects | Matching is time-consuming and never perfect; requires a pre-test |
In repeated measures, counterbalancing can be used to minimise order effects by varying the sequence of conditions for different participants. In independent groups, random allocation to conditions helps distribute participant variables evenly.
在重复测量设计中，可以采用平衡法来减少顺序效应，通过改变不同被试接受条件的顺序来实现。在独立组设计中，将被试随机分配到不同条件有助于均匀分布被试变量。
Choosing the most appropriate design depends on the nature of the investigation, the availability of participants, and the need to control specific confounds.
选择最合适的设计取决于调查的性质、被试的可获得性以及控制特定混淆变量的需要。
5. Sampling Techniques | 抽样方法
The target population is the entire group the researcher is interested in. Because testing everyone is impossible, a sample is drawn. The representativeness of the sample directly affects the generalisability of findings.
目标总体是研究者感兴趣的整个群体。由于不可能对所有人都进行测试，因此抽取一个样本。样本的代表性直接影响研究结果的普遍性。
Common sampling methods for AS practicals include opportunity sampling (using whoever is available, e.g., classmates), random sampling (every member of the target population has an equal chance of being selected), and stratified sampling (identifying subgroups and randomly selecting from each in proportion to their population frequency). In WJEC assessments, you are often expected to justify your sampling choice and discuss its implications.
AS 实践常用的抽样方法包括机会抽样（使用任何可接触的人，如同学）、随机抽样（目标总体中的每个成员都有均等的机会被选中）和分层抽样（确定子群体并按其在总体中的比例从每个子群体中随机抽取）。在 WJEC 评估中，往往要求你为自己的抽样选择提供理由并讨论其影响。
Opportunity sampling is quick and convenient but often biased. Random sampling reduces researcher bias but requires a complete list of the population, which is rarely feasible. Stratified sampling improves representativeness but is complex. Sample size also matters: larger samples tend to be more representative and minimise the impact of anomalies.
机会抽样快捷方便，但常带有偏见。随机抽样能减少研究者偏差，但需要有完整的总体名单，这在实际中很少可行。分层抽样提高了代表性，但操作复杂。样本量也很重要：较大的样本通常更具代表性，并能减少异常值的影响。
6. Ethical Considerations | 伦理考虑
All psychological investigations must adhere to the British Psychological Society (BPS) Code of Ethics. In your practical exam or report, you must demonstrate awareness of ethical principles and explain how you would address them.
所有心理学调查都必须遵守英国心理学会（BPS）的伦理准则。在你的实践考试或报告中，必须展示对伦理原则的认识，并说明将如何处理它们。
Key ethical issues include informed consent (participants should know the aims and what they will do before agreeing), deception (should be avoided unless necessary and justified, and followed by a thorough debrief), protection from harm (psychological or physical), right to withdraw at any time, and confidentiality (data must be anonymous and securely stored).
关键的伦理问题包括知情同意（被试在同意前应了解研究目的和要做的事情）、欺骗（除非必要且有正当理由，并随后进行充分的解释说明），保护被试免受伤害（心理或生理）、随时退出的权利以及保密（数据必须匿名并安全保存）。
For AS practicals, you will typically use a consent form, provide a debrief sheet explaining the true nature of the study, and ensure that no personal data is identifiable. When working with children or vulnerable groups, additional safeguards are necessary. Even minor breaches of ethics can cost marks, so always plan these aspects thoroughly.
对于 AS 实践研究，你通常会使用知情同意书，提供解释研究真实情况的事后说明，并确保任何个人信息都无法识别。当研究对象涉及儿童或弱势群体时，还需要额外的保护措施。即使轻微的伦理失当也可能失分，因此务必全面规划这些方面。
7. Data Collection Methods | 数据收集方法
Although experiments are central to the practical, WJEC also expects you to understand other methods such as observations, questionnaires, and interviews. For your Personal Investigation, you will most often use an experiment or a structured observation generating quantitative data.
尽管实验是实践的核心，WJEC 也期望你了解其他方法，如观察、问卷和访谈。对于你的个人调查，最常用的是实验或结构化观察，以产生定量数据。
A laboratory experiment offers high control and replicability but may lack ecological validity. A field experiment takes place in a natural setting, increasing realism but reducing control. Quasi-experiments study naturally occurring IVs (e.g., age, gender) and cannot establish causation as firmly. Observations can be structured (using behavioural checklists) or naturalistic; they must address issues like inter-observer reliability.
实验室实验控制程度高、可重复性强，但可能缺乏生态效度。现场实验在自然环境中进行，提高了真实性但降低了控制。准实验研究自然发生的自变量（如年龄、性别），不能像真实验那样确立因果关系。观察法可采用结构化（使用行为核查表）或自然观察；必须解决诸如观察者间信度等问题。
Questionnaires and interviews collect self-report data and are useful for researching attitudes and opinions, but they are prone to social desirability bias and low response rates. Whichever method you use, clear, standardised instructions and a systematic data recording sheet are essential.
问卷和访谈收集自我报告数据，对于研究态度和意见非常有用，但易受社会赞许性偏差和低回复率的影响。无论使用哪种方法，清晰、标准化的指导语和系统化的数据记录表都至关重要。
8. Descriptive Statistics and Graphical Representation | 描述统计与图表呈现
Once data are collected, you must summarise and present them clearly. Measures of central tendency (mean, median, mode) and measures of dispersion (range, standard deviation) are the basic tools.
收集到数据后，你必须清晰地总结和呈现。集中趋势的度量（均值、中位数、众数）和离散程度的度量（全距、标准差）是基本工具。
The mean is used for interval/ratio data, but is affected by outliers. The median is appropriate for ordinal data or when there are extreme scores. The mode is the only measure for nominal data. The range is a crude measure, while standard deviation indicates how spread out scores are around the mean; a smaller SD means more consistent data.
均值用于等距/比率数据，但受异常值影响。中位数适用于顺序数据或存在极端分数的情况。众数是名义数据唯一可用的度量。全距是一种粗略的度量，而标准差表示分数围绕均值的离散程度；SD 越小，数据越一致。
Present data in well-labelled graphs: bar charts for nominal/categorical data, histograms for continuous interval data, and scatterplots for correlational analysis. Always give clear titles and label axes with units. In your report, the descriptive statistics should lead directly into the choice of inferential test.
用标注清楚的图形呈现数据：条形图适用于名义/类别数据，直方图适用于连续等距数据，散点图用于相关分析。始终给出明确的标题并以单位标注坐标轴。在你的报告中，描述统计应直接导向推断统计检验的选择。
9. Inferential Statistics and Significance | 推断统计与显著性
Inferential tests allow you to determine whether the results are statistically significant or likely due to chance. WJEC AS typically covers non-parametric tests: Chi-squared (χ²), Mann-Whitney U, Wilcoxon signed-rank, and Binomial Sign test.
推断检验可让你判断结果是否具有统计显著性，还是可能由偶然因素造成。WJEC AS 通常涵盖非参数检验：卡方检验（χ²）、曼-惠特尼 U 检验、威尔科克森符号秩检验和二项符号检验。
To choose the right test, consider three questions: (1) What is the level of measurement? itney or Wilcoxon. (2) Is the design independent groups or repeated measures/matched pairs? groups; Wilcoxon for repeated measures. (3) Are you testing a difference or an association? Chi-squared test of association for two nominal variables.
要选择合适的检验，考虑三个问题：（1）数据的测量水平是什么？名义数据 → 卡方（针对频数），顺序数据 → 曼-惠特尼 U 或威尔科克森。（2）研究设计是独立组还是重复测量/配对？独立组用曼-惠特尼 U；重复测量用威尔科克森。（3）你是检验差异还是关联？两个名义变量的卡方检验用于关联。
ls or exceeds the critical value (for most tests), or falls below for certain tests, the result is significant and the null hypothesis is rejected. A result of 'p < 0.05' means there is less than a 5% probability that the observed effect is due to chance.
计算值要与选定显著性水平（通常 p ≤ 0.05）上的临界值表进行比较。如果计算值等于或大于临界值（大多数检验），或对于某些检验低于临界值，则结果显著，拒绝零假设。结果的 'p < 0.05' 意味着观察到的效应由偶然因素造成的概率小于 5%。
χ² = Σ (O - E)² / E
Report findings clearly, e.g., ' 0.05, df = 1, so the null hypothesis was rejected and a significant association was found.'
清晰报告结果，例如：“计算得到的 χ² 值（12.38）大于 p < 0.05、df = 1 时的临界值（3.84），因此拒绝零假设，发现存在显著关联。”
10. Validity, Reliability and Controls | 效度、信度与控制
Internal validity refers to whether the study truly measures what it claims to, free from confounding variables. External validity concerns whether findings can be generalised to other settings (ecological validity), other people (population validity), and over time (historical validity).
内部效度指的是研究是否真正测量了它所宣称的内容，不受混淆变量影响。外部效度关乎研究结果是否能推广到其他环境（生态效度）、其他人（总体效度）以及跨越时间（历史效度）。
Reliability is about consistency. Internal reliability can be checked using split-half methods, while external reliability concerns whether the same results would be obtained on a different occasion. In practical investigations, standardised procedures, clear instructions, and careful operationalisation of variables all enhance reliability.
信度关乎一致性。内部信度可通过分半法检验，而外部信度则涉及在不同场合下是否能获得相同的结果。在实践调查中，标准化的程序、清晰的指导语以及对变量的精心操作化都有助于提高信度。
To control extraneous variables, you can use standardisation (keeping all aspects of the procedure the same across conditions), counterbalancing, randomisation, and single- or double-blind procedures. Always identify potential confounding variables in your evaluation and suggest improvements for future research.
为了控制额外变量，你可以采用标准化（保持所有条件下程序的所有方面一致）、平衡法、随机化以及单盲或双盲程序。始终在你的评价中指出潜在的混淆变量，并为未来的研究提出改进建议。
11. Writing the Practical Report | 撰写实践报告
A standard practical report follows the conventions of psychological journals. The sections include: Abstract (a short summary of the study, around 150 words, covering aim, method, results, and conclusion), Introduction (background research, rationale, aims, and formal hypotheses), Method (design, participants, apparatus/materials, and procedure – detailed enough for replication), Results (descriptive and inferential statistics, graphs), Discussion (summary of findings, relationship to previous research, limitations, and suggestions for future research), and References (cited in APA style). Appendices may include consent forms, debrief materials, or raw data tables.
标准的实践报告遵循心理学期刊的格式。各部分包括：摘要（简要概括研究，约 150 字，涵盖目的、方法、结果和结论）、引言（背景研究、依据、目的和正式假设）、方法（设计、被试、仪器/材料和程序——详细到可以复制）、结果（描述和推断统计、图表）、讨论（结果总结、与既往研究的关系、局限性及对未来研究的建议）和参考文献（按 APA 格式引用）。附录可包括同意书、事后说明或原始数据表。
In the Method section, be precise. State the experimental design, the IV and DV, the number of participants and how they were sampled. Outline the step-by-step procedure using the past tense and third person. In the Results section, do not interpret the findings; that belongs in the Discussion.
在方法部分，要精确。写明实验设计、自变量和因变量、被试人数及抽样方式。使用过去时和第三人称分步概述程序。在结果部分，不要解读发现；解读属于讨论部分。
Marks are often awarded for how well you link your findings to psychological theories or models and for the depth of your critical evaluation. Always reference ethical considerations and suggest realistic, well-justified modifications.
分数通常会根据你是否将发现与心理学理论或模型良好联系，以及批判性评价的深度来评定。始终提及伦理考虑，并提出现实、理由充分的修改建议。
12. Common Pitfalls and Tips for Success | 常见陷阱与成功秘诀
One common mistake is writing a hypothesis that is not testable, such as using vague terms or stating a prediction that cannot be operationalised. Always check that your IV and DV are clearly defined and measurable.
一个常见错误是写出不可检验的假设，例如使用模糊的术语或陈述无法操作化的预测。务必检查你的自变量和因变量是否被清晰定义并可测量。
Another pitfall is confusing correlation with causation. In a correlational study, no matter how strong the relationship, you cannot assert that one variable causes the other. Use appropriate language like 'associated with' or 'linked to'.
另一个陷阱是混淆相关与因果。在相关研究中，无论关系有多强，都不能断言一个变量导致了另一个。应使用适当的语言，如“与…有关联”或“与…相联系”。
Practise identifying the correct inferential test for a given scenario, as the decision-making process often appears in exam questions. For your own investigation, double-check which test fits your design and level of measurement; a mismatch will weaken your conclusions.
练习为给定场景选择正确的推断检验，因为这个决策过程经常出现在考题中。对于你自己的调查，仔细确认哪个检验适合你的设计和测量水平；不匹配会削弱你的结论。
Time management during the practical write-up is critical. Allocate enough time for the evaluation section, as high-level AO3 marks are won by discussing methodological limitations and offering logical improvements, not just listing them. Finally, always back up your points with evidence from the data or from the psychological literature.
在撰写实践报告时，时间管理至关重要。为评价部分分配足够的时间，因为高级别的 AO3 分数是通过讨论方法学局限并提出合理的改进措施来获得的，而不仅仅是罗列。最后，始终用数据证据或心理学文献来支持你的论点。
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