Question 4 of 6, Step 1 of 3 Correct University officials hope that changes they have made have improved the retention rate. Last year, a sample of 1999 freshmen showed that 1563 returned as sophomores. This year, 1669 of 2065 freshmen sampled returned as sophomores. Determine if there is sufficient evidence at the 0.05 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. Ho : PI = P2 Ha : P P2 Answer Tables Keypad Keyboard Shortcuts 0 > O .