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Late payment of medical claims can add to the cost of health care. Suppose 83.3% of the claims were paid in full when first submitted for one insurance company. The insurance company developed a new payment system in an effort to increase this percentage. A sample of 240 claims processed under this system revealed that 216 of the claims were paid in full when first submitted. Complete parts a and b below. Find the z-test statistic. (Hint: Use the formula for calculating a z-test statistic for proportions. Use .833 (83.3%) as your hypothesized population proportion. Chapter 9.2) (Round to two decimal places as needed.)
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