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University officials hope that changes they have made have improved the retention rate. In 2010, a sample of 1926 freshman showed that 1400 returned as

University officials hope that changes they have made have improved the retention rate. In 2010, a sample of 1926 freshman showed that 1400 returned as sophomores. In 2011, 1508 of 2011 freshman sampled returned as sophomores. Determine if there is sufficient evidence at the 0.05 level to say that the retention rate has improved.

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