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Zigzag
random sampling ,systematic sampling , self-selected , and there is one more i don't know
There is no sampling method that will select the exact population.
Non probability sampling and probability sampling are different because probability sampling uses random samples. Non probability sampling aren't random, but can still be representative of the population as a whole if done correctly.
The only way to get rid of sampling error is to use the entire population under study. This is usually impossible, so the next best thing is to use large samples and good sampling methods.
what are four methods of determining populations size?
Zigzag
There are many such methods: cluster sampling, stratified random sampling, simple random sampling.Their usefulness depends on the circumstances.
Quota sampling stratified sampling random sampling convenient sampling cluster sampling semi stratified sampling stratified quota
chemicals
random sampling ,systematic sampling , self-selected , and there is one more i don't know
The basic methods used by ecologists to study the living world include experimenting, classifying, and modelling, but not observing.
There is no sampling method that will select the exact population.
Non probability sampling and probability sampling are different because probability sampling uses random samples. Non probability sampling aren't random, but can still be representative of the population as a whole if done correctly.
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Amniocentesis and chorionic villi sampling.
Following are methods:1 - direct method2 - indirect method