Random sampling - where each member of the population has equal chance of being chosen., Stratified sampling - where a proportionate number of observations is taken from each part of a known population., Systematic sampling - where observations are taken at regular intervals. used., Opportunistic sampling - Samples are chosen based on what is available to the investigator. , Taking photos - is an example of opportunistic sampling I used. , Bi-polar survey  - is an example o systematic sampling I used. , Systematic sampling advantage - Quicker, easier and more convenient to carry out than random sampling and can be more accurate. Fairer, Systematic sampling disadvantage - can inadvertently pick up bias,, Opportunistic sampling main advantage - avoids dangerous places, allows you to respond to what you see - focus on quality of places. , Opportunistic sampling main disadvantage - Data is unlikely to accurately represent the population - bias.,

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