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A sample survey is asked of a limited group of people, while a census is conducted in an attempted to get an answer from all people in a geographical area.
You are taking a sample
The population is a group of interest, such as the people who filled out a recent survey about their age. The parameter is the descriptive measure of that population. So in this example, a parameter could be the average age of the people who filled out the survey.
The words, observation and survey, each have several different meanings, but they also have a meaning that is similar. One definition of observation and survey is the act of observing, looking or seeing. Another definition for observation is the act of noticing something. Another definition for survey is the act of making an inspection.
the larger the group, the more likely the statistical probability of loss will be equal