A union leader of a major company claims that the new incentive scheme of the contract has resulted in average weekly earnings well under $500 for all customer service workers. She takes a random sample of 16 workers and finds that their weekly earnings have an average of $478.52 and a standard deviation of $52.25. Assume the distribution of weekly earnings is normal. What is the approximate p-value (closest) for testing the appropriate hypotheses? Round final answer to 4 decimal places. Do not round intermediate calculations.