STATS 10 Chapter 7: Chapter 7_ Survey Sampling and Inference
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Population : the group of people or objects we wish to study. Sample : a collection of people or objects taken from the population. Parameter : a numerical value that characterizes some aspect of the population. Census : a survey in which every member of the population is measured. Statistics : a number that estimates a population parameter derived from the sample (sometimes called estimators , and the resulting numbers are called estimates ) Very large (often unknown) nearly impossible to obtain all values from. Parameters : measures that come from the population. Sample : portion of the population of interest. Usually taken to measure a characteristic about a population. Size of sample (usually denoted by n) Statistics : measures that come from the sample. Typically, we use greek letters to represent population parameters and latin letters to represent sample statistics. There are problems with taking a census (a survey in which every member of the population is measured):
