A health care executive is using regression to predict total revenues. She has decided to include both

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Question:

A health care executive is using regression to predict total revenues. She has decided to include both patient length of stay and insurance type in her model. Insurance type can be grouped into three categories: Government-Funded, Private-Pay, and 'Other'. Her model is
(a) Y = bo.

(b) Y = bo blX1.

(d) Y = bo + b1X1 + b2X2 + b3X3.

(e) Y = bo + b1X1 b2X2 + b3X3 +b4X4.