Lesson 7 of 9
The big picture
Show on a big screenAsk the whole group. Mark each answer. Check the key. Read the scale.
| Idea | Remember |
|---|---|
| What is data | Collected facts, not a guess. A small group can differ from the whole class. |
| Tally marks | One stroke each time. Every fifth stroke closes a group of five. |
| Pictographs | A picture stands for a number. Check the key. |
| Bar graphs | Bar length = count ÷ scale. Read the scale first. |
| Reading graphs | Find the bars the question names. Then compare or add. |
| Choosing | Tally to count live. Pictograph for small counts. Bar graph for big numbers. |
Open Chapter 4, Data Handling and Presentation, in your book. You have tried every idea in it.