📚 Year 7 CIE Statistics: Winter Break Intensive Revision Plan | Year 7 CIE 统计：寒假强化复习计划
The winter break is a crucial time to consolidate your understanding of Year 7 statistics and build confidence ahead of the next term. A well-structured intensive revision plan will help you master data handling, averages, charts, and basic probability. This guide provides a complete roadmap to turn your holiday into a productive learning period.
寒假是巩固七年级统计学知识、为下学期树立信心的关键时期。一个结构合理的强化复习计划能帮助你掌握数据处理、平均数、图表和基础概率。本指南提供了一份完整的路线图，让你的假期变成高效学习时段。
1. Setting Your Revision Goals | 设定你的复习目标
Before you start, set clear and achievable goals. Decide how many topics you want to revisit and how many practice questions you aim to complete each day. Write down your goals and tick them off as you progress. This keeps you motivated and organised.
开始之前，设定清晰且可实现的目标。决定你想复习多少个主题，以及每天计划完成多少道练习题。写下你的目标，并在完成后打勾。这能保持动力和条理。
Make a checklist of the main topics: data types, tally charts, bar charts, pie charts, line graphs, mean, median, mode, range, and probability. Knowing what you need to cover helps you avoid missing anything important.
制作一份主要主题清单：数据类型、计数表、条形图、饼图、折线图、平均数（均值、中位数、众数）、极差和概率。了解你需要覆盖的内容，避免遗漏任何重要知识点。
2. Understanding Data Types | 理解数据类型
Data can be categorical (qualitative) or numerical (quantitative). Categorical data describes qualities or groups, such as favourite colour or pet type. Numerical data consists of numbers and can be discrete or continuous. Discrete data comes from counting, like the number of students in a class, and takes exact values. Continuous data comes from measuring, like height or time, and can take any value within a range.
数据可分为分类数据（定性）和数值数据（定量）。分类数据描述品质或组别，比如最喜欢的颜色或宠物种类。数值数据由数字组成，可以是离散的或连续的。离散数据来自计数，如班级学生人数，取精确值。连续数据来自测量，如身高或时间，可以在一个范围内取任意值。
Recognising data types is essential because it determines which chart or average to use. For example, you cannot calculate a mean for categorical data but you can find the mode.
识别数据类型很关键，因为它决定了使用哪种图表或平均数。例如，你无法计算分类数据的均值，但可以找到众数。
3. Collecting and Organising Data | 收集与整理数据
In a statistical investigation, you start by posing a question and collecting data. Use surveys, observations, or experiments. When conducting a survey, design a simple questionnaire and record responses using tally marks. A tally mark represents each data point, and every fifth mark crosses the previous four to make counting easier.
在统计调查中，首先要提出问题并收集数据。可以使用调查、观察或实验。进行调查时，设计简单的问卷，并用计数符号记录回应。每个计数符号代表一个数据点，每第五个符号划掉前四个，方便计数。
Always ensure your data is accurate and organised. Organised data allows you to spot trends and make comparisons quickly.
始终确保数据准确有序。整理好的数据能让你快速发现趋势并进行比较。
4. Frequency Tables and Tally Charts | 频数表与计数表
A tally chart is a simple way to record data as you collect it. Once all data is recorded, you can transfer the tallies into a frequency table. The frequency column shows the total count for each category or group. Always include clear titles and labels.
计数表是收集数据时进行记录的简单方法。记录完所有数据后，你可以将计数转移成频数表。频数列显示每个类别或组别的总数。一定要加上清晰的标题和标签。
For grouped numerical data, define equal-width class intervals, such as 0–9, 10–19, and so on. Make sure intervals do not overlap. This skill is often tested in CIE Year 7 exams.
对于分组的数值数据，要定义等宽的组距，如 0–9、10–19 等。确保区间不重叠。这项技能在 CIE 七年级考试中经常考查。
5. Bar Charts and Pictograms | 条形图与象形图
Bar charts display categorical or discrete data using rectangular bars of equal width. The height or length of each bar represents the frequency. Always label the axes, give the chart a title, and space the bars equally. Bars can be drawn vertically or horizontally.
条形图用等宽的矩形条显示分类或离散数据。每个条形的高度或长度表示频数。务必标注坐标轴、给图表加标题，并使条形间距相等。条形可以垂直或水平绘制。
Pictograms use symbols or pictures to represent a certain number of data points. A key is essential to show what one symbol stands for, e.g., one smiley face equals 2 students. When a fraction of a symbol is used, it must be drawn accurately to reflect the data.
象形图使用符号或图片来表示一定数量的数据点。图例必不可少，说明一个符号代表什么，如一个笑脸代表 2 名学生。当需要使用部分符号时，必须准确绘制以反映数据。
6. Pie Charts and Line Graphs | 饼形图与折线图
A pie chart shows how a total is divided into parts. To construct a pie chart, calculate the angle for each sector using the formula: angle = (frequency ÷ total frequency) × 360°. Then use a protractor to draw each slice. Every pie chart needs labels or a legend.
饼形图展示总量如何被划分成各个部分。要绘制饼图，先用公式计算每个扇形的角度：角度 = (频数 ÷ 总频数) × 360°。然后用量角器画出每个扇形。每个饼图都需要标签或图例。
Line graphs are used to display continuous data and show trends over time. Plot points carefully and join them with straight lines. Do not forget to label the horizontal and vertical axes and scale them evenly.
折线图用于显示连续数据并展示随时间变化的趋势。仔细描点并用直线连接。不要忘记标注横轴和纵轴，并均匀地设置刻度。
7. Averages: Mean, Median, Mode | 平均数：均值、中位数、众数
The three common averages summarise a data set. The mean is calculated by adding all values and dividing by the number of values.
三种常见的平均数可以总结一组数据。均值是通过将所有数值相加再除以数值的个数来计算的。
Mean = Σx ÷ n
The median is the middle value when the data is ordered from smallest to largest. If there are two middle numbers, the median is the mean of those two.
中位数是将数据从小到大排序后的中间值。如果有两个中间数，则中位数是这两个数的均值。
The mode is the value that appears most often. A data set can have one mode, more than one mode, or no mode at all.
众数是出现次数最多的值。一组数据可以有一个众数、多个众数或没有众数。
Remember to show all your working steps in the exam, especially for mean and
Published by TutorHao | Year 7 统计 Revision Series | aleveler.com
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