Sources of Data
Data: Observations of the Amount of Daylight
Observations are one type of data. Watch this video again. Notice how long daylight lasts for the summer and the winter day.
| Keyboard Shortcut | Action |
|---|---|
| Space | Pause/Play video playback |
| Enter | Pause/Play video playback |
| m | Mute/Unmute video volume |
| Up and Down arrows | Increase and decrease volume by 10% |
| Right and Left arrows | Seek forward or backward by 5 seconds |
| 0-9 | Fast seek to x% of the video. |
| f | Enter or exit fullscreen. (Note: To exit fullscreen in flash press the Esc key. |
| c | Press c to toggle captions on or off |
How did you know when daylight had started and ended?
Data: Total Hours of Daylight
This graph is another type of data. It shows that the number of daylight hours changes from January to December. You can use the video and the daylight graph to answer the question: How does the amount of daylight change over a year?
Click to see larger version
Why is it helpful to use data from the graph and the video when investigating how the number of daylight hours changes in a year?
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