We sampled slope angle, vegetation, wind speed and temperature every 10 metres.
- It meant every area of the dune was sampled - we could see that trend changes with distance
- Most of the sand dunes are missed out because we only sampled every 10m
- We may have picked out a trend in nature - eg underlying limestone might cause chalky soils which only allow some plants to grow - This could give us a false impression
Could have used random sampling and put numbers 1 - 200 in a hat to decide where to do our measurements.
BUT in order for it to be truly random we would have to put the numbers back, and all the places we picked out might be the same place 20 times which wouldn't give us an appropriate picture