=+2 The bank sets up an experiment to test the effectiveness of the DVD. The DVD is mailed to several randomly selected delinquent customers, and employees keep track of how many customers then contact the bank to arrange payments. The bank just got back the results on their test of the DVD strategy.

A 90% confidence interval for the success rate is (0.29, 0.45).

Their old send-a-letter method had worked 30% of the time.

Can you reject the null hypothesis and conclude that the method increases the proportion at a = 0.05? Explain.