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Lesson 9 of 10

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8 min

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Keep these seven lines in mind before you answer.

The line to keep from each idea about charts
IdeaThe line to keep
Two shapes of dataStructured data fits rows and columns. Unstructured data does not.
Four ways to collectWatch it, ask it, measure it, or let a device record it.
File formatsA format decides how easily data is read, shared and analysed.
Clean firstRemove copies and fix errors and gaps before you count or chart.
Bar, line or pieA bar chart compares groups. A line graph shows change over time. A pie chart shows parts of a whole.
Reading a chartRead the title, the axis labels and units, and the legend first.
Precise and accurateAccuracy is closeness to the true value. Precision is how fine and steady the readings are.

Which of these is structured data?

  • Marks typed into a table
  • A recording of a lesson
  • A video of sports day

A photo of a marks table is saved on a phone. Can a program sort the marks from it directly?

  • Yes, because a clear photo holds the numbers
  • Yes, if the photo is sharp and well lit
  • No, because a photo is one picture, not rows

You count the cycles parked at the gate and ask nobody. Which way is this?

  • A survey
  • Observation
  • Digital collection

A step counter on a phone saves your steps all day. Which way is this?

  • Digital collection
  • Observation
  • A survey

Which file does a plain text editor show as readable text?

  • A JPG picture
  • An MP3 song
  • A CSV file

Why does a data format matter?

  • It decides whether the data inside is true or false
  • It affects how easily data is read and analysed
  • It changes the numbers stored inside the file

A table lists the same row twice. What do you do first?

  • Remove the copy
  • Count both rows
  • Draw the chart anyway

A mark is blank. The source sheet cannot tell you the mark. What is the careful step?

  • Type in a mark you made up
  • Delete the whole table
  • Mark the cell as missing

A plant's height is noted every day for a month. How is its change best shown?

  • A pie chart
  • A line graph
  • A list of numbers

Which question fits a pie chart?

  • How is a class of 30 split between three houses?
  • How did a water tank's level change through a day?
  • Which of four classes has the most students?

A bar shows 4 for week 3. The unit on the axis is thousand litres. How much water is that?

  • 4 litres
  • 400 litres
  • 4000 litres

A chart shows water use for four weeks. Which statement stays with what it shows?

  • Week 4 used more water than week 3
  • Week 4 used more water because it was hotter
  • Water use will keep rising for ever

A kitchen scale weighs a checked 600 g weight. It shows 612, 611 and 612 g. What is the scale?

  • Accurate and precise
  • Precise but not accurate
  • Accurate but not precise

A ruler marked in whole centimetres reads 7 cm. A program prints 7.0000 cm. What do the extra zeros add?

  • A finer ruler
  • A more accurate reading
  • No new fact

What is metadata?

  • Data that has been cleaned
  • A very large file
  • Facts that describe the data

You can now name the shape of data. You know how it was collected and stored. You can clean it, pick a chart and read it with care. You can tell precise from accurate.

Next, AI Ethics & Bias asks what an AI learns from unfair data.

Reveal every answer to finish this lesson.