This is the third in a series of articles on quantitative evaluation in health promotion written by Damien Jolley for the Health Promotion Journal of Australia. The first of these articles, published in the December 2000 issue, discussed the ideas behind sample surveys and how they can be used to improve evaluation of health promotion initiatives.1 The second, in the April 2001 issue, discussed confidence intervals in more detail and presented some strategies for computing confidence intervals for population percentages, both manually and using appropriate computer software. 2
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