Table 1.1 Calculations of Standard Deviations (SDs) from counts of small snails in 15 samples. Note
the very large SD for Sample 5 in Column 2, due to a value of 233 being entered instead of 23. When
this was corrected (Column 3), Sample 5 still had a large SD, but this was correct. It was due to naturally
large abundances and patchiness in this sample.