Suppose you want to take a random sample of GMAT test scores to determine whether there is any significant difference between the GMAT scores for the test given in March and the scores for the test given in June. You gather the following data from a sample of persons who took each test. Use the Mann-Whitney U test to determine whether there is a significant difference in the two test results. Let a = .10.

March June

540 .......350

570 .......470

600 .......630

430 .......590

500 .......610

510 .......520

530 .......460

560 .......550

550 .......530

490 .......570