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a line transect looks like a few lines and dots used to mark a certain area.
Transect sampling is a method used in ecological studies to assess the distribution and abundance of species within a specific area. It involves laying out a predetermined line or path, called a transect, across a habitat and systematically sampling at regular intervals along this line. This approach helps researchers collect data on various ecological parameters, such as plant density or species diversity, while minimizing bias and ensuring that the sampling represents the overall environment. It's particularly useful in studying gradients or changes in ecosystems, such as those influenced by environmental factors.
In practice, systematic sampling is used on account of its simplicity and convenience. It's easy to explain to the people doing the actual work. It can be justified theoretically wherever the population from which units are to be sampled systematically are randomly distributed. It can be used for sampling households, sampling callers on a telephone line, sampling plants along a transect in (say) a field, sampling people passing through customs, and so on.
A line of best-fit.
A straight line, a telephone line, a shipping line, a fishing line.