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Statistics & ExperimentsFree

Build statistical intuition before formulas.

Statistics Foundations

Learn how center, spread, distributions, z-scores, and skewness describe what a dataset is actually saying.

What you will leave with

You can summarize a dataset with the right measures, recognize misleading averages, and explain the shape behind the numbers.

Modules
4
Duration
~4 hours
Level
Beginner
Access
Free course
  • Interactive mean/median animations
  • Python statistics examples
  • Real-world data scenarios

What you will be able to do

What this course prepares you to do.

The curriculum is organized around these 4 practical outcomes.

Choose between mean, median, and mode

Measure and interpret variability

Read common distribution shapes and z-scores

Recognize skew and select robust summaries

Course map

One connected route through Statistics Foundations.

4 modules / ~4 hours

Curriculum

Every module earns the next one.

Open a module to inspect every section before you start. Your progress follows you through the course.

01
Module 1

Finding the Center

BeginnerFree

Why Do We Need This?, The Mean (Average), The Median (Middle Value), and more.

View 5 sections
  1. 1Why Do We Need This?
  2. 2The Mean (Average)
  3. 3The Median (Middle Value)
  4. 4The Mode (Most Popular)
  5. 5Which One Should You Use?
60 min5 sections
Open module
02
Module 2

Measuring the Spread

BeginnerFree

Why Spread Matters, Range and Quartiles, Variance and Standard Deviation, and more.

View 5 sections
  1. 1Why Spread Matters
  2. 2Range and Quartiles
  3. 3Variance and Standard Deviation
  4. 4Box Plots
  5. 5Real-World Examples
65 min5 sections
Open module
03
Module 3

Understanding Distributions

BeginnerFree

The Normal Distribution, The 68-95-99.7 Rule, Z-Scores, and more.

View 5 sections
  1. 1The Normal Distribution
  2. 2The 68-95-99.7 Rule
  3. 3Z-Scores: Standardizing Data
  4. 4Skewness: When Data Isn't Symmetric
  5. 5Other Distribution Shapes
55 min5 sections
Open module
04
Module 4

Understanding Skewness

BeginnerFree

What is Skewness?, Why Does Data Get Skewed?, When to Use Median Instead of Mean, and more.

View 5 sections
  1. 1What is Skewness?
  2. 2Why Does Data Get Skewed?
  3. 3When to Use Median Instead of Mean
  4. 4Spotting Misleading Statistics
  5. 5Comparing Measures Across Distributions
50 min5 sections
Open module

Who this course is for

Built for people who need to use the skill.

Start with the background you have. The prerequisite notes above tell you exactly what is assumed.

01

Statistics beginners

02

Analysts who use metrics but want stronger intuition

03

Learners preparing for probability and machine learning

Start the course

Begin with Finding the Center.

Module 1 introduces the language and example used throughout the rest of the course.

Open Module 1
Statistics Foundations, Interactive Data Science Course | Let's Data Science