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20 Cards in this Set
- Front
- Back
the entire group under study as specified by the research project. ex heads of households in those metropolitan areas served by Terminix.
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population
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a subset of the population that should represent that entire group
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sample
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defined as an accounting of everyone in the population. sample is used because this is normally completely unobtainable due to time, accessibility issues, and cost
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census
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any error in a survey that occurs because a sample is used.
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sampling error
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what two factos case sampling error?
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the method of sample selection and the size of the sample
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in order to select a sample you will need a ------ ----------, which is some master list of all the members of the population. ex if a researcher had defined a population to be all shoe repair stores in montana, he would need a master listing of these stores as a fram from which to sample.
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sample frame
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be it great or small, exists for sample frames in the forms of mis-, over-, or underrepresentations of the true population in a sample frame.
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sample fram error
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whenever a sample is drawn, the amount of potential sample frame error should be judged by the----------. sometimes the only available sample frame contains much potential sample frame error, but it is used due to the lack of any other sample frame
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researcher
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aka e. the amount of sample error that will be associated with the survey. used to indicate how close your sample percentage finding will be to the true population percentage if it were repeated many, many times
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desired accuracy
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amount of people in a sample who qualify to take a survey. ex. 4 out of 5 people in a sample use mouthwash. 80% is the ----- ---- which means 20% percent are not usable.
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incidence rate
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potential respondents who qualify are refusing to take the survey. failures by qualified respondents to take part in the survey
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non response
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one in which every member of the population has an equal chance, or probability, of being selected into that sample.
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random sample
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sample methods that embody random sampling are often termed ---------- -------- -----------, because the chance of selection can be expressed as a probability
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probability sample methods
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what are the four types of probability sampleing methods?
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simple random sampling, systematic, cluster sampling, and stratified sampling
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probability of being selected into the sample is known and equal for all members of the population. researcher uses a table of random numbers, random digit dialing, or some other random selection procedure that guarantees each member of the population has an identical chance of being selected into the sample
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simple random sampling
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with simple random seampling if the researcher was surveying a population of 100,000 recent dvd player buyers with a sample size of 1000 respondents the probability of selection on any single population member in this would be
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1 % sample size/population size. 1000/100,000
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a way to select a simple random sample from a directory or list that is much more efficient than with simple random sampling, beause with a list, the researcher must scan all the names to match up each random number.
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systematic sampling
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the goal of systematic sampling is to literally skip through the list in a systematic way, but to begin at a random starting point in the list. that is, the research calculates ----- ----
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skip interval
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skip interval forumula
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population list size/sample size. if calculated to be 100, the researcher will select every 100th name on the list
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the population is divided into sub groups called ------ each of which represents the entire population
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cluster sampling, cluster
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