AlgèbreFacile
Math Learning PlatformAdvanced Statistics - Charts and Dispersion
Intermediate
📚 statistiques
📖 About this lesson
Represent data graphically and measure dispersion
Lesson Content
Advanced Statistics
Types of charts
Bar chart: ideal for comparing categories.
Pie chart: shows proportions as percentages.
Histogram: for continuous data.
Line graph: shows trends over time.
Measures of dispersion
Range
Max value - Min value
[object Object],: 2, 5, 8, 9, 12 → Range = 12 - 2 = ,[object Object]
Quartiles
- •[object Object],: median of lower half
- •[object Object],: median
- •[object Object],: median of upper half
[object Object], = Q3 - Q1
Box plot (Box and whisker)
Shows: Min, Q1, Median, Q3, Max — great for visualizing data distribution.
Correlation
- •[object Object],: both variables increase together
- •[object Object],: one increases, other decreases
- •[object Object],: no apparent link
Practical Examples
1
Example 1
📋 Problem
Data: 3, 7, 7, 9, 10, 12, 15. Find range and Q2.
✅ Solution
Range = 12, Q2 = 9
💡 Explanation
Range = 15 - 3 = 12. Q2 = middle value = 9 (4th of 7 values).
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