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BUS 367 FINAL Ch. 13 Sample Size Determination
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Key Concepts:
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the larger the sample, the more accurate the research
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random sampling error varies with sample size
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increasing the sample size, decreases the width of the confidence interval at a given confidence level
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3 factors are required to specify sample size:
-variance of the population
-magnitude of acceptable error- indicates how precise the estimate must be
-confidence level
as heterogeneity increases, so must sample size
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estimating sample size for questions involving means:
-estimate the standard deviation of the population
-make a judgement about the allowable magnitude of error
-determine a confidence level
sequential sampling
application of results from one or more pilot studies prior to deciding on the sample size for a definitive study
auxiliary variables
those that the researcher should build into a survey that allow a comparison between sample units that do respond and those that do not respond
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