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Late payment of medical claims can add to the cost of health care. Suppose 72.8% 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 220 claims processed under this system revealed that 174 of the claims were paid in full when first submitted. Complete parts a and b below. a. State the appropriate null and alternative hypotheses. Choose the correct answer below. O A. Ho: Z =0.728 O B. Ho: p=0.728 HA : 2 > 0.728 HA : p > 0.728 O C. Ho: P= 0.728 O D. Ho: p = 0.728 HA : p=0.728 HA : p = 0.728 b. Based on the sample data, test the null hypothesis using an alpha level equal to 0.01. Discuss the results of the test. Find the z-test statistic. (Round to two decimal places as needed.) Compute the p-value. The p-value is (Round to four decimal places as needed.) Determine a conclusion. Choose the correct answer below. A. Do not reject Ho, because the p-value is not less than the level of significance. Therefore, the statement that the population proportion exceeds 0.728 is statistically supported by these sample data. O B. Reject Ho, because the p-value is not less than the level of significance. Therefore, the statement that the population proportion exceeds 0.728 is not statistically supported by these sample data. O C. Do not reject Ho, because the p-value is not less than the level of significance. Therefore, the statement that the population proportion exceeds 0.728 is not statistically supported by these sample data. O D. Reject Ho, because the p-value is not less than the level of significance. Therefore, the statement that the population proportion exceeds 0.728 is statistically supported by these sample data