A Bank Manager Is Interested in Assigning a Rating to the Holders

Essay

A bank manager is interested in assigning a rating to the holders of credit cards issued by her bank.The rating is based on the probability of defaulting on credit cards and is as follows. To estimate this probability,she decided to use the logistic model where
y = a binary response variable with value of 1 corresponding to a default,and 0 to a no default
x₁ = the ratio of the credit card balance to the credit card limit (in %)
x₂ = the ratio of the total debt to the annual income (in %)
Using Minitab on the sample data,she arrived at the following estimates: Note: The p-values of the corresponding tests are shown in parentheses below the estimated coefficients.
If only applicants with excellent and good ratings are qualified for a loan,find a linear relation between their balance ratio and their debt ratio that must be satisfied to be qualified.