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SAMPLING TECHNIQUES
WHAT IS SAMPLING?

1. Sampling is a shortcut method for investigating a whole population.
2. Data is gathered from a small part of the whole parent population or sampling frame, and used to
inform what the whole picture is like.

WHY DO WE NEED TO SAMPLE? WHY NOT…

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RANDOM LINE SAMPLING
1. Pairs of coordinates or grid references are obtained using random number tables, and marked on a
map of the study area.
2. These lines are joined to form lines to be sampled.


RANDOM AREA SAMPLING
1. Random number tables generate co-ordinates or grid references which are…

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METHODOLOGY

SYSTEMATIC POINT SAMPLING
1. A grid is used and points can be at the intersections of a grid line, or in the middle of each square.
2. Sampling is done at the nearest feasible place.
3. Along a transect line, sampling points for, say vegetation day collection, could be…

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4. A systematic approach can still be used, say by asking every fifth person.


STATIFIED RANDOM SAMPLING
1. A wide range of data and fieldwork situation can lend themselves to this approach ­ wherever there
are two study areas being compared e.g. two woodlands with distinctly different habitats.
2. Random…

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