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:   {H0:p=0.87Ha:p≠0.87   Find the test statistic for this hypothesis test for a proportion. Round your answer to 2 decimal places.

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.