Week 17 · Data and AI

Data analysis: cleaning, statistics and charts

Your sensors can take a reading every few seconds — thousands a day. Raw numbers mean nothing until someone cleans them, summarises them and shows them. That someone is a data analyst, one of the fastest-growing jobs in tech. Today you analyse a day of classroom light readings.

Software, data and AI90 minutesAdvancedLevel 2 module

In this lesson you will

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Load a CSV of sensor readings and find and skip bad rows
Calculate mean, median, minimum and maximum and explain what each tells us
Draw a labelled line chart with matplotlib
Write honest conclusions from data, including its limits

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Enrolled students get the complete notes: essential theory, key terms, a step-by-step practical walkthrough, an independent challenge, check-your-understanding questions and the take-home task.

Data analysis: cleaning, statistics and charts

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