Amtrack is considering changing the train schedule for trains that stop at the Utica trainstation. There are 8 trains that stop at the station daily, so an Amtrack employee interviews an SRS of 15 people from each of the trains to gather input regarding the train schedule. What type of sample was taken?
Amtrack is considering changing the train schedule for trains that stop at the Utica trainstation. There are 8 trains that stop at the station daily, so an Amtrack employee interviews an SRS of 15 people from each of the trains to gather input regarding the train schedule.
What type of sample was taken?
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voluntary response sample |
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cluster sample |
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simple random sample |
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convenience sample |
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stratified sample |
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systematic sample |
Sampling methods:
In simple random sampling, all the units in the population have equal chance of being selected as a sample.
In Stratified random sampling, the population is divided into groups based on a characteristic. Then, sample would be selected from each of the sub-population using random method.
In cluster random sampling, the population is divided into groups and one of the groups is selected at random. All the units in the selected group (cluster) are considered as sample.
In systematic random sampling, first sample is selected at random. Then every kth unit is selected as sample. The value of k is obtained by dividing population size by sample size.
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