A hospital administrator claims that the proportion of knee surgeries that are successful is 87%. To test this claim, a random sample of 450 patients who underwent knee surgery is taken and it is determined that 371 of these patients had a successful knee surgery operation. The following is the setup for this hypothesis, test: Ho Ha p = 0.87 p0.87 Find the test statistic for this hypothesis test for a proportion. Do not round until final answer. Round final answer to 2 decimal places. Provide your answer below: Test Statistic