Lesson 4 of 8
Draw a chart to compare groups
Show on a big screenStart to draw a bar chart. Which question will it answer?
Step 1 of 3
- "How do most come?" 3 groups, 3 bars. Easy to compare.
- "Which is longer, Student 3's or Student 7's?" 2 students, 2 bars. Just read the table.
- "Which day was it?" 1 group, 1 bar. Nothing to compare.
The rule
Draw a chart when the question compares groups. For one row, read the table.
Bars stand side by side, so you can compare their heights.
You need more than one group. Use a chart when many rows fall into a few groups. One bar for each row is just the table again. Finding one fact in one row is a lookup.
| Question | Groups | Best place |
|---|---|---|
| How long is Student 9's trip? | one row | the table |
| How do most of them come? | 3: on foot, by cycle, by bus | a chart |
| Which is longer, Student 3's trip or Student 7's? | 2, one per student | the table |
| Which day was it collected? | 1, the same for all | the table |
Tap what answers the question.
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Try the lab to finish this lesson.