5.1 Data Handling

• Meaning of data and collecting data from different situations
• Tally and frequency distribution tables
• Choosing a suitable scale for graphs
• Pictographs
• Bar graphs: drawing and interpreting
• Pie charts: drawing and interpreting
• Line graphs
• Travel graphs and use of data in real life

• state the meaning of data in a learning situation
• collect data from different situations
• draw a frequency distribution table of data from different sources
• determine a suitable scale for graphs of data from different situations
• draw pictographs of data from real-life situations
• draw bar graphs of data from different sources
• interpret bar graphs of data from real-life situations
• draw pie charts of data from real-life situations
• interpret pie charts of data from real-life situations
• draw a line graph of data from different situations
• interpret travel graphs from real-life situations
• promote the use of data in real-life situations

“Why do we collect data?”

“How do we represent data?”

“How do we interpret data?”

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1. What data is, and collecting it
   40 min · 1 practice tasks · quiz
   Data are facts collected for a question; Grade 7 gathers counts from class, market, weather and travel with permission and honesty.
2. Frequency distribution tables
   40 min · 1 practice tasks · quiz
   Tally raw lists in gates of five and write a frequency table whose frequencies add to the total.
3. A suitable scale for graphs
   40 min · 1 practice tasks · quiz
   Choose a scale from the largest frequency so that a bar or picture fits the page and still shows differences.
4. Drawing pictographs
   40 min · 1 practice tasks · quiz
   Draw a pictograph with a title, equal symbols and a key such as one bowl equals two learners.
5. Drawing bar graphs
   40 min · 1 practice tasks · quiz
   Draw a bar graph with title, labelled axes, a stated scale, equal bar widths and a zero baseline.
6. Interpreting bar graphs
   40 min · 1 practice tasks · quiz
   Read most, least, difference and total from a bar graph, then make a fair canteen decision.
7. Drawing pie charts
   40 min · 1 practice tasks · quiz
   Turn frequencies into angles with (frequency / total) x 360°, then draw sectors with a protractor.
8. Interpreting pie charts
   40 min · 1 practice tasks · quiz
   Read a pie as fractions and comparisons of one whole, and choose when a pie is better than a bar.
9. Drawing line graphs
   40 min · 1 practice tasks · quiz
   Plot time on the horizontal axis and a quantity on the vertical, then join the points to show change.
10. Travel graphs and using data
    40 min · 1 practice tasks · quiz
    Read a distance-time graph (steep is faster, flat is a stop) and promote data for canteen, weather, travel and community decisions.