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Each demo takes about five minutes in your browser, spoken or typed, with no account. The cases are fictional. At the end you see the grade Viva's three AI graders propose, with the evidence for each mark.

• Data and statistics · About 5 minutes

  Defend your data analysis

  Read a chart of a market's weekly sales, say what it shows and what it does not, and defend how you read it.

  The examiner knows the chart from its description and asks about the bars that do not mean what they seem.

  Try it: Defend your data analysis

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