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(a) Is systematic sampling, because the first element is randomly chosen, then every element after is chosen at uniform interval, in this case every 20th car.
(b) Is simple random sampling, since every number has an equal chance of being selected as the sample.
(c) is stratified sampling because the population was separated into groups called strata then the simple random sampling technique was used to select 5% from each group.
(d) is convenient sampling since students were picked by means of convenience.
(e) is cluster sampling, because the population was naturally divided into groups called clusters.
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