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population is a set of existing units.
we examine some of the population measurements, we are conducting a census of
random sample is selected so that on each selection from the population every
unit remaining in the population has an equal chance of being chosen.
process is in statistical control if it does not exhibit any unusual
example of a quantitative variable is the make of a car.
example of a qualitative variable is the mileage of a car.
inference is the science of using a sample of measurements to make
generalization about the important aspects of a population of
we sample without replacement, we do not place the unit chosen on a particular
selection back into the population.
taking a systematic sample, in which we select every 100th shopper
arriving at a specific store, we are approximating a random sample of
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