University officials hope that changes they have made have improved the retention rate. Last year, a sample of 19991999 freshmen showed that 15631563 returned as sophomores. This year, 16691669 of 20652065 freshmen sampled returned as sophomores. Determine if there is sufficient evidence at the 0.050.05 level to say that the retention rate has improved. Let last year's freshmen be Population 1 and let this year's freshmen be Population 2.   Step 1 of 3 :   State the null and alternative hypotheses for the test. Fill in the blank below

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