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I am doing a health related project at at hospital where a policy was implemented for patients on certain therapy. Data was collected for the number of patients and days of therapy pre-implementation, then data was collected for the same interval of time post-implementation. How should I go about data analysis?

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More detail would be helpful. Is days of therapy the outcome you are interested in examining? Are the actual patients the same pre- and post-intervention or are they different groups of patients? If the former, then you have a within-subjects design, and you could use ANOVA. If the groups are different then you'd probably want to consider something like a simple t-test to see whether the groups significantly differ on the outcome.

Erik Ruzek
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