Give different groups of students different sampling techniques to use (for lower sets this could just be simple random sampling and systematic), but for higher sets you can include stratified, quota etc). Students use their technique to come up with the numbers of 10 squares. Each group then gets to come up to the computer and see the 10 squares they have selected. They then use this info to estimate the number of grasshoppers in the field. The answer is at the end of the smart file. Students can present their technique and solution to each other. Prize for the closest answer?
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