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It is a discrete random variable.
Random variables is a function that can produce outcomes with different probability and random variates is the particular outcome of a random variable.
yes
Random errors can be parallax and from changes in the environment.
simple random sample is to select the sample in random method but systematic random sample is to select the sample in particular sequence (ie 1st 11th 21st 31st etc.)• Simple random sample requires that each individual is separately selected but systematic random sample does not selected separately.• In simple random sampling, for each k, each sample of size k has equal probability of being selected as a sample but it is not so in systematic random sampling.