September 1 - September 1, 2006 Population vs. Samples...

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September 1, 2006 Population vs. Samples Population : every individual score in the set of scores you are trying to measure, in a particular setting o Population = every Lego in the box Sample : set of individuals from the population that are intended to represent the population o Used to estimate the population…representative o Not always going to be a good representation of the population o Sampling error – discrepancy between sample and population statistic Parameter : a characteristic of the population . Denoted with Greek letters Statistic : a characteristic of a sample . Denoted with English letters such as ‘X’ or ‘S’. Data : (pl.) a set of observations or measurements Raw score : (Datum) a single observation/measurement Variable : changing characteristic or condition for different individual o Anything that varies across individuals Constant : characteristic/condition that does not change across individuals o All Undergrad students are between age of 18-22
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September 1 - September 1, 2006 Population vs. Samples...

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