Question: In 2010 Bank of America reported that 7 1 of its
In 2010, Bank of America reported that 7.1% of its credit card holders were at least 30 days overdue on their monthly payments. In 2014, a random sample of 450 credit card customers found that 20 were at least 30 days overdue on their monthly payments. Using a 90% confidence interval, can you conclude that the proportion of delinquent card holders changed since 2010?
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