Question: A study was conducted to evaluate effectiveness of a work site health promotion program in reducing prevalence of cigarette smoking. 16 work sites were randomly assigned to either implement the health program or to make no changes for a period of two years. The promotion consisted of health education classes combined with a payroll-based incentive system. Below are the prevalence estimates from each site at the end of the 2-year period. Data from one site was unavailable due to data confidentiality issues at that site.

Evaluate the hypotheses.

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