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1
Identify a population of interests
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Obtain a random sample of the population
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Measure the values of our variables in the sample and calculate the central tendency
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The central tendency measured for any variable in our population will be our best estimate of the central tendency of that variable in the population
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By taking into account the dispersion of values around the central tendency in the sample, we can use statistical theory to estimate how far off the estimate is likely to be from the actual population