The Board of Governors of the U.S. Federal Reserve System regularly monitors credit card delinquency rates in the United States. At its peak after the 2007–2008 recession, delinquency rates reached 6.77% in the second quarter of 2009. Since its peak, delinquency rates have declined to a new low of 2.12% in the second quarter of 2015. You are charged with checking the most recent credit card delinquency rates in the United States. Using a random sample of 450 credit card customers, you found that 19 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 its lowest point in 2015?