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The standard deviation would generally decrease because the large the sample size is, the more we know about the population, so we can be more exact in our measurements.
The absolute value of the standard score becomes smaller.
Sure it can. But in the survey business, the trick is to select your sample carefully so that they'll be equal, i.e. a sample that is accurately representative of the population.
the standard deviation of the sample decreases.
The standard deviation of the population. the standard deviation of the population.