According to recent reports, the average FICO score for Americans is 600. Suppose you obtain a SRS of 22 loan applications and record their credit scores: 494, 728, 468, 533, 747, 639, 430, 690, 604, 422, 356, 805, 749, 600, 797, 702, 628, 625, 617, 647, 772, 572 a.) Determine the mean and standard deviation of the credit scores in this sample. b.) Use a 0.10 level of significance to test the claim that the average FICO score is greater than 600. Null: The average FICO score is 600. Alternative: The average FICO score is greater than 600. H_0: H_a: alpha = Test Statistic: t = df = P-value: Conclusion (in a complete sentence):