Case 1: Century National Bank
The Century National Bank has offices in several cities in the Midwest and the southeastern part of the United States. Mr. Dan Selig, president and CEO, would like to know the characteristics of his checking account customers. What is the balance of a typical customer? How many other bank services do the checking account customers use? Do the customers use the ATM service and, if so, how often? What about debt cards? Who uses them, and how are they used?
To better understanding the customers, Mr. Selig asked Mrs. Wendy Lamberg, Director of planning, to select a sample of customers and prepare a report. To begin, she has appointed a team of us. Then, we started by selecting a random sample of 60 customers. In addition to the balance in each account at the end of last month, we determined: * The number of ATM (automatic teller machine) transactions in the last month. * The number of other bank services (a saving account, a certificate of deposit, etc) the customer uses. * Whether the customer has a debt card (this is a relatively new bank service in which charges are made directly to the customer's account). * Whether or not interest is paid on the checking account. * The sample includes customers from the branches in Cincinnati, Ohio; Atlanta, Georgia; Louisville, Kentucky; and Erie, Pennsylvania.
Banking Data Set-case:
X1 = Account balance in $
X2 = Number of ATM transactions in the month
X3 = Number of other bank services used
X4 = Has a debt card (1 = Yes, 0 = No)
X5 = Receives interest on the account (1 = Yes, 0 = No)
X6 = City where banking is done.

Answers:
Q1 : All the 60 checking accounts are shown in the graph gradually between 32 to 2558

First we divided the figures to classes by applying this formula : 2k  n N =60 k= 6 2k = 64
Second step we found the width of each class by