Systematic Sampling
The goal of systematic sampling is to ensure even coverage across the sample area. Therefore, the first sample unit is drawn at random, but the remainder of the sample is chosen at a fixed interval. In this activity you will again be conducting a 6% sample, and the survey interval will be set at 15 to ensure even coverage of the area.
Instructions:
- Click on the random number
button to generate a random number between 1 and 15. This will be your starting number.
- Then find the number on the grid, and click on that
square.
- A star will appear if there are artifacts in that square and dirt will appear if there are no artifacts.
- As you click on a square, you will see the
number of objects found in that square appear below
the map.
- A star will appear if there are artifacts in that square and dirt will appear if there are no artifacts.
- Record the artifacts foundon the Raw Data Table as the information appears.
- If you are using the excel sheet, save often.
- Add 15 to
your starting number and click on the next square, which will ensure coverage across the entire site area.
- Continue
this process untill you have uncovered 16 squares.
- Continue on to the next page for the stratified random sampling technique.
Things to Know:
- Make sure that every time you click within the grey box below you are
clicking on a square in the grid to uncover the artifact. If you click
somewhere else within the grey box before all 16 squares are uncovered,
you will need to hit the reset button to uncover enough squares.
- Hitting the reset button or navigating away from the page will cause all the data on this page to be lost. Make sure you record your data before you do this.
- If for any reason you cannot uncover all 16 squares (i.e. if you accidentally click too many times), simply hit reset and uncover the remaining squares you need.
Time: 20-25 mins.
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