A sample (short for sample set) can at it's core be any set of information that has been obtained using the scientific method.
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Because they are based on samples and outcomes vary between different samples.
There are 25C7 different samples of seven from a pool of 25.25C7 = 25!/(7!(25-7)!) = 480 700 different samples of 7
stratified sampling, in which the population is divided into classes, and random samples are taken from each class;cluster sampling, in which a unit of the sample is a group such as a household; andsystematic sampling, which refers to samples chosen by any system other than random selection.
Yes you can.
there are over 1000 different types of years