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A researcher is interested in determining the proportion of public elementary schools that have a mandatory school uniform policy. The researcher randomly sampled n=400 public elementary schools and found that 100 of the schools have a mandatory school uniform policy. Suppose the researcher found a test statistic of z=2.5 when testing to determine if the true percentage of public elementary schools with a mandatory school uniform policy exceeds 20%. Find the p-value for the test.

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