📚 Key Points for Experiments and Practical Assessments in Year 10 Edexcel Psychology | Edexcel 心理学 Year 10 实验与实践考核要点
In Year 10 Edexcel Psychology, understanding how to design, conduct and evaluate experiments is crucial for both coursework and exams. Practical assessments test your ability to apply research methods, handle data and consider ethical issues. This article summarises the key points you need to master.
在Year 10 Edexcel心理学中，理解如何设计、实施和评估实验对课程作业与考试都至关重要。实践考核检验你应用研究方法、处理数据以及考量伦理问题的能力。本文汇总你需要掌握的核心要点。
1. Introduction to Experiments and Practical Work | 实验与实践工作简介
An experiment is a research method used to test a cause-and-effect relationship between variables. In Year 10 practicals, you will often carry out laboratory experiments in a controlled setting, allowing you to manipulate one variable and measure its effect on another while keeping other factors constant.
实验是一种用于检验变量之间因果关系的研究方法。在Year 10实践课中，你通常会进行实验室实验，在受控环境中操纵一个变量并测量其对另一个变量的影响，同时保持其他因素不变。
Your practical assessments will require you to demonstrate skills in designing a study, collecting data, applying descriptive statistics and evaluating your findings. These skills are assessed through written tasks and sometimes direct observation.
你的实践考核要求你展示设计研究、收集数据、应用描述性统计和评价研究结果的技能。这些技能通过书面任务、有时也通过直接观察来评估。
2. Experimental Designs | 实验设计
Choosing the right experimental design is fundamental. The three main designs are independent groups, repeated measures and matched pairs. Each has its strengths and weaknesses regarding participant variables and order effects.
选择合适的实验设计是基础。三种主要设计分别是独立组设计、重复测量设计和匹配对设计。每种设计在处理参与者变量和顺序效应方面各有优缺点。
| Independent groups design | 独立组设计：不同的参与者被分配到实验的不同条件中，避免了顺序效应，但可能存在参与者变量混淆。 |
| Repeated measures design | 重复测量设计：同一组参与者经历所有实验条件，消除了参与者变量，但可能产生顺序效应，需要采取平衡措施。 |
| Matched pairs design | 匹配对设计：将参与者按相关特质配对，再随机分入不同条件，试图控制参与者变量，但匹配过程耗时且不易完美。 |
You should be able to justify your choice of design and suggest how to control confounding variables, for example by using random allocation or counterbalancing.
你应当能够解释你选择某一种设计的理由，并提出如何控制混淆变量，例如使用随机分配或平衡法。
3. Variables and Operationalisation | 变量与操作化定义
The independent variable (IV) is what you deliberately change or manipulate. The dependent variable (DV) is what you measure to see if there is an effect. All other variables that could affect the DV are extraneous variables and must be controlled.
自变量是你有意改变或操纵的变量。因变量是你为了观察效应而测量的变量。其他所有可能影响因变量的变量都属于额外变量，必须加以控制。
Operationalisation means defining exactly how the IV and DV will be manipulated or measured. For example, if you are testing how noise affects memory, you might operationalise 'noise' as listening to music at 70 dB and 'memory' as the number of words correctly recalled from a list.
操作化意味着精确界定如何操纵自变量或测量因变量。例如，如果你在测试噪音如何影响记忆，你可以将“噪音”操作化为听70分贝的音乐，将“记忆”操作化为从单词表中正确回忆出的单词数量。
A clear operational definition allows others to replicate your experiment and ensures your data are objective and reliable.
清晰的操作化定义让其他人能够重复你的实验，并确保你的数据客观且可靠。
4. Formulating Hypotheses | 假设的提出
An experimental hypothesis predicts the relationship between the IV and DV. You should be able to write a null hypothesis (H₀) and an alternative hypothesis (H₁). The null hypothesis states there is no significant effect or difference, while the alternative suggests there is.
实验假设预测自变量与因变量之间的关系。你应当会写出零假设（H₀）和备择假设（H₁）。零假设陈述没有显著效应或差异，而备择假设指出存在效应或差异。
Your alternative hypothesis can be directional (one-tailed) if you predict a specific direction of effect, e.g. 'Participants who learn in silence will recall more words than those who learn with loud music.' It is non-directional (two-tailed) if you simply predict a difference without stating the direction.
如果你的预测指明了具体的效应方向，备择假设可以是方向性的（单尾），例如“在安静环境下学习的参与者会比在嘈杂音乐中学习的参与者回忆更多单词”。如果你只是预测有差异但不指明方向，它就是非方向性的（双尾）。
In your practical write-ups, always state both hypotheses clearly at the start.
在你的实践报告中，一定要在开头清晰陈述两种假设。
5. Sampling Methods | 抽样方法
The way you select participants affects how well your findings can be generalised. Common sampling techniques include opportunity sampling, random sampling, systematic sampling and stratified sampling.
选择参与者的方式会影响研究结果的可推广程度。常见的抽样技术包括机会抽样、随机抽样、系统抽样和分层抽样。
Opportunity sampling uses people who are easily available, such as classmates. It is quick but may be biased. Random sampling gives everyone in the target population an equal chance of being selected, reducing bias but often being impractical. Stratified sampling ensures subgroups are proportionally represented, improving representativeness.
机会抽样使用容易接触到的人，例如同学。它快速但可能有偏差。随机抽样让目标人群中的每个人都有平等被选中的机会，能减少偏差但常常不切实际。分层抽样确保各子群按比例被代表，提高了代表性。
For your Year 10 practical, you will most likely use opportunity sampling. You should acknowledge the limitations of your sampling method when evaluating your study.
在Year 10的实践中，你很可能会使用机会抽样。在评价研究时，你应当承认所用抽样方法的局限性。
6. Ethical Considerations | 伦理考量
All psychological research must follow ethical guidelines to protect participants from harm. Key principles include informed consent, right to withdraw, confidentiality, protection from psychological or physical harm, and debriefing.
所有心理学研究都必须遵守伦理准则，以保护参与者免受伤害。核心原则包括知情同意、退出权、保密、保护参与者免受心理或身体伤害，以及事后解释。
When conducting a practical in class, you must ensure participants know what the task involves and that they can stop at any time. After the study, you should explain the true purpose of the experiment and answer any questions. If deception is necessary, it must be justified and minimised.
在课堂上进行实践时，你必须确保参与者了解任务内容，并知道他们可以随时退出。研究之后，你应解释实验的真实目的并回答任何问题。如果欺骗不可避免，必须提供理由并将其降至最低。
In your written work, always include a section that describes how you addressed these ethical issues.
在你的书面作业中，务必加入一节描述你如何处理了这些伦理问题。
7. Carrying Out the Experiment: Procedures and Controls | 实施实验：程序与控制
A standardised procedure is vital for reliability. This means all participants should be tested under the same conditions, using identical instructions, timings and materials. Write a step-by-step protocol so that someone else could replicate your study exactly.
标准化程序对信度至关重要。这意味着所有参与者应当在相同的条件下被测试，使用完全相同的指导语、计时和材料。写出一步步的操作规程，使他人能够精确地重复你的研究。
You need to identify potential extraneous variables and control them. For instance, if you are testing memory for words, you might standardise the font size, lighting in the room and the time allowed for recall. Controlling these prevents them from becoming confounding variables.
你需要识别潜在的额外变量并加以控制。例如，如果你在测试单词记忆，你可能会统一字体大小、房间照明和回忆允许的时间。控制这些变量可以防止它们成为混淆变量。
During the experiment, stick to your plan and record data accurately. Any deviation from the procedure should be noted as it might affect the validity of your results.
实验过程中，要坚持原定计划并准确记录数据。任何偏离程序的情况都应予以记录，因为它可能影响结果的效度。
8. Data Collection and Descriptive Statistics | 数据收集与描述性统计
Once you have collected raw data, the next step is to summarise it using descriptive statistics. The three main measures of central tendency are mean, median and mode. The mean is the arithmetic average, the median is the middle score when data are ordered, and the mode is the most frequent score.
当你收集了原始数据后，下一步是使用描述性统计进行汇总。三种主要的集中趋势量数是平均数、中位数和众数。平均数是算术平均值，中位数是排序后位于中间的数值，众数是出现频率最高的数值。
Mean = ΣX / N (Sum of all scores divided by the number of scores)
To decide which measure is most appropriate, consider if there are extreme scores (outliers). The median is less affected by outliers, while the mean uses all values and is more sensitive.
要决定使用哪个量数更合适，需考虑是否存在极端值（异常值）。中位数受异常值影响较小，而平均数利用了所有数值，更加敏感。
A measure of dispersion, such as the range, tells you about the spread of scores. The range is calculated as the highest score minus the lowest score. You may also be asked to interpret bar charts, tables or scattergrams from practical data.
离散量数，比如全距，可以告诉你分数的分布情况。全距等于最高分减去最低分。你可能还需要根据实践数据解读条形图、表格或散点图。
9. Practice Task Examples (Memory, Stroop, etc.) | 实践任务示例（记忆、Stroop等）
Common practical tasks in Year 10 Edexcel Psychology include memory experiments, such as testing the capacity of short-term memory using a digit span task, or investigating the effect of interference on recall.
Year 10 Edexcel心理学中常见的实践任务包括记忆实验，例如使用数字广度任务测试短时记忆的容量，或者研究干扰对回忆的影响。
Another classic example is the Stroop task, where you examine how reading an automatic process interferes with naming the colour of the ink. In a simple practical, you might compare the time taken to name ink colours when the word and colour match versus when they conflict.
另一个经典示例是Stroop任务，你考察阅读这一自动加工如何干扰说出墨水颜色。在一个简单的实践中，你可以比较当单词与颜色一致时和冲突时，说出墨水颜色所需的时间。
You may also design experiments on factors affecting eyewitness testimony, such as leading questions. In all these tasks, you will need to apply the same design, ethical and statistical principles.
你也许还需要设计实验研究影响目击证词的因素，例如引导性问题。在所有这些任务中，你都需要运用相同的设计、伦理和统计原则。
10. Evaluating Experiments: Validity and Reliability | 评价实验：效度与信度
Internal validity asks whether the experiment truly measures what it intends to measure, and whether the IV really caused the change in the DV. Threats to internal validity include confounding variables, demand characteristics and experimenter bias.
内部效度考察实验是否真正测量了它假设测量的东西，以及自变量是否确实导致了因变量的变化。对内部效度的威胁包括混淆变量、需求特征和实验者偏差。
External validity refers to how well the findings can be generalised to other settings, people and times. If your experiment used only Year 10 students, the results might not apply to older adults or other cultures.
外部效度指的是研究结果能在多大程度上推广到其他情境、人群和时间。如果你的实验只使用了Year 10学生，其结果可能不适用于老年人或其他文化。
Reliability concerns consistency. An experiment is reliable if it can be repeated and produce similar results. Standardised procedures improve reliability. You should also consider if any aspects of your study might have reduced reliability.
信度关注一致性。如果一个实验能够被重复并得出相似的结果，它就是可信的。标准化的程序能提高信度。你还应当考虑研究中是否有任何方面可能降低了信度。
11. Writing Up Your Practical Report | 撰写实践报告
Your practical report should follow a clear structure: Abstract, Introduction (including aims and hypotheses), Method (design, participants, materials, procedure), Results (descriptive statistics and graphical representation), Discussion (explanation of findings, links to theories, evaluation) and References. You must also include an ethics section.
你的实践报告应当遵循清晰的结构：摘要、引言（包括目的和假设）、方法（设计、参与者、材料、程序）、结果（描述性统计与图表展示）、讨论（解释结果、联系理论、评价）和参考文献。你还必须包括伦理部分。
In the Method, give enough detail for replication. In the Results, present your data clearly; do not interpret it yet. In the Discussion, link your findings back to your hypothesis and suggest improvements for future research.
在方法部分，提供充足的细节以利于重复。在结果部分，清晰地呈现数据；不要在此处解读。在讨论部分，将你的发现与假设联系起来，并对未来研究提出改进建议。
Using accurate psychological terminology throughout your report will demonstrate your understanding and gain credit in assessments.
在整篇报告中使用准确的心理学术语，可以展示你的理解，并在考核中获得认可。
12. Common Mistakes to Avoid | 常见错误避免
Mixing up the independent and dependent variables is a frequent error. Always identify which variable you manipulated and which you measured. Poor operationalisation, such as defining memory as 'how well participants do', is too vague.
混淆自变量和因变量是一个常见错误。务必明确哪个变量是你操纵的，哪个是你测量的。操作化定义不清晰，例如将记忆定义为“参与者表现如何”，这太过含糊。
Forgetting to consider ethical issues, such as not allowing participants to withdraw or failing to debrief them, can lower your mark considerably. Another mistake is submitting a report with little or no evaluation of validity and reliability.
忘记考虑伦理问题，比如不允许参与者退出或没有进行事后解释，会大幅降低你的分数。另一个错误是提交的报告缺少或根本没有对效度和信度的评价。
Finally, avoid presenting raw data without a summary. Examiners expect to see tables of central tendency or range as a minimum, along with a simple graph if possible. Always double-check your calculations.
最后，避免只呈现原始数据而不做汇总。考官期望至少看到集中趋势或全距的表格，如果可能再配以简单的图表。务必反复检查你的计算。
Published by TutorHao | Psychology Revision Series | aleveler.com
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