Become a data detective over five weeks: master mean, median, mode, and range, collect clean data, build stunning charts, spot trends and correlations, train a simple machine learning classifier, and present your findings as a compelling data story. Every concept comes with hands-on interactive tools where you build visualizations live and practice the same skills used by real data scientists, journalists, and business analysts.
What Is Data?
Interactive: Statistics Playground
A class has test scores: 70, 75, 80, 82, 99. Which statistic is most affected by...
The mean is found by adding all values and dividing by the count. The median is ...
Outliers: The Oddballs in Your Data
Interactive: Outlier Detective
Removing an outlier from a dataset will always change which statistic the most?
A dataset has values 12, 18, 25, 7, 31. What is the range?
When is the median a better summary than the mean?
From Words to Tables
Which table correctly structures: "We bought half a dozen apples, 3 bananas, and...
In a data table, columns are the variables (kinds of information) and rows are t...
Collecting Good Data
Interactive: Survey Builder
A survey asks: 'Don't you agree our school lunches are terrible?' What's wrong w...
A survey asks people questions directly. An experiment tests a hypothesis with c...
Cleaning Messy Data
Which of these are data quality problems? Select all that apply.
Why is a larger sample size generally better?
Choosing the Right Chart
Interactive: Chart Picker Challenge
You want to show how your city's temperature changed across 12 months. Which cha...
Building Charts From Scratch
Interactive: Chart Builder
The x-axis runs horizontally and usually shows categories or time. The y-axis ru...
A bar chart starts its y-axis at 95 instead of 0, making a difference of 3 point...
When should you NOT use a pie chart?
Trends, Correlations, and Stories
Interactive: Trend Spotter
A study finds that students who eat breakfast get better grades. Which conclusio...
Exploring Correlations Hands-On
Interactive: Correlation Explorer
A correlation coefficient of 1 means a perfect positive relationship. A value of...
Data Storytelling
Which is the correct order for a data story?
Why can't we conclude causation from correlation alone?
What Is Machine Learning?
Interactive: ML Classifier Trainer
A model that sorts photos into 'cat' or 'dog' is performing:
From Words to Numbers
Interactive: Word Frequency Analyzer
In a word frequency analysis, 'stop words' like 'the', 'is', and 'a' are often r...
In machine learning, the data used to teach the model is called the training dat...
Which of these is an example of machine learning in everyday life?
Data Analysis Capstone
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