學生真實見證

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STUDENT STORIES

學生真實見證・奪星實錄

聽下歷屆同學點樣由補底、操卷到掌握 DSE 數學關鍵技巧

DSE 數學 5**

陳同學 ｜ 5** 奪星學員

「MC 技巧班真係幫我慳咗好多時間，成份卷可以提早 20 分鐘做完！」

Level 2 衝上 Level 5

黃同學 ｜ 補底衝五學員

「以前甲部題目成日失手，上完精讀課程之後個 concept 終於通返晒。」

甲部滿分穩定發揮

李同學 ｜ 終極操卷班學員

「Past Paper 題型歸納好清晰，一睇題目已知題目伏位同公式。」

由懼怕數學到自信應考

張同學 ｜ 中六全期學員

「上堂節奏明快，每星期操卷後有詳細解題影片，溫習方向好明確。」


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Data Distribution vs Box Plot Explorer

📊 Data Distribution & Box Plot Aligner

Continuous Grouped Data vs. Box-and-Whisker Plot Teaching Demo

Presets:
Total Freq (N) 77 Observations
Min Data 152 Lowest mark
Lower Quartile (Q₁) 157.0 25th Percentile
Median (Q₂ / M) 162.0 50th Percentile
Upper Quartile (Q₃) 172.0 75th Percentile
Max Data 187 Highest mark
IQR (Q₃ - Q₁) 15.0 Middle 50% spread
Mean (x̄) 164.3 Arithmetic average
Distribution Shape: Positively Skewed (Right-skewed) — Mean (164.3) > Median (162.0). The long tail extends to the right; the upper whisker and box segment are elongated.
Dual Aligned Coordinate Display

Histogram (Touching Bars)

Box Plot

Q₁

Q₂ (Median)

Q₃

Class Frequency Sliders (Drag to update charts in real-time) Class Width: 5 | Range: 150 – 189

 📖 Teaching Notes & Visual Alignment Concept ▼ 

1. Exact Vertical Alignment

Because the histogram bars and box plot share the exact same horizontal coordinate range (149.5 to 189.5), students can look straight down from any bar to find its corresponding quartile position.

2. Quartile Meaning (25% / 50% / 75%)

The dashed vertical lines partition the cumulative data into 4 equal counts. Notice how high frequencies in lower classes pull Q1 and Q2 to the left, creating a long right whisker.

3. Skewness Intuition

Right-skewed: Mean > Median, (Q3 - Q2) > (Q2 - Q1).
Left-skewed: Mean < Median, (Q2 - Q1) > (Q3 - Q2).
Symmetrical: Mean ≈ Median, balanced whiskers.

Video

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學生真實見證

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MATHIT · STUDENT STORIES

學生真實見證

聽聽同學分享，在 Mathit 學習數學的體驗。

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