The delinquency rate for bank-issued credit cards rose 11% in the first three months of the year,

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The delinquency rate for bank-issued credit cards rose 11% in the first three months of the year, according to credit-reporting agency TransUnion. The delinquency rate jumped to 1.32% this year, from 1.19% in the first three months of 2008, TransUnion said. The statistic measures the percentage of card holders who are three months or more past due on their payments for Master- Card, Visa, American Express and Discover cards. The average total debt on bank cards also rose, jumping to $5,776 from $5,548 last year. Balances typically rise in the first quarter, as holiday spending comes due, said Ezra Becker, director of consulting and strategy in TransUnion’s financial services group. But retail sales results showed holiday spending took a steep drop. That likely means higher balances reflect consumers using credit cards to pay for necessities, he said.

a). What is the population?

b). Name at least 3 variables that must have been used.

c). Classify all the variables of the study as either attribute or numerical.