A regional bank reviewed its outstanding credit card accounts. Bank managers learned that overall 20% of their clients made no monthly payment. In the most recent month, they sampled 400 accounts and learned that 88 customers missed their monthly payment. Use MegaStat to perform an analysis and answer the following questions.

a. State the hypotheses for this analysis.

b. State the decision rule, using = .05.

c. Calculate the sample proportion, the test statistic and its p value, and the confidence interval.

d. Has this sample's rate of missed payments changed compared to the overall population? Explain your reasoning.

e. Interpret the meaning of the confidence interval.

f. Is the normality assumption for this sample met? Explain your reasoning.