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Data gathering in two different samples such that there is matching of the first sample data drawn and a corresponding data value in the second sample.
An event sample is data points captured for a single event. A time sample are data points capture over a specific period of time.
sample data drawn from one population is completely unrelated to the selection of sample data from the other population.
The population is every data point you intend to generalise the survey results to. The sample frame is those data points that you can pick from for the survey. The sample is which of these data points you actually survey, and the sample size is how many of those data points there are. For instance, if you have 700 students in a school, and you have access to 300 of them, and decide to give 30 of them a survey, the sample size is 30.
sample size refers to the collection of data by only a selected size of te population through the process of sample surveys and sampling methods used in collecting data.