where P(yj |xi) is the fraction of examples with X = xi that belong to class yj . The entropy after splitting on X is given by the weighted entropy of the children nodes:

What type of error occurs when a valid subject using a biometric authenticator is not authenticated?

A. A Type 1 error B. A Type 2 error C. A Type 3 error D. A Type 4 error

Declaring instance variables ________ is known as data hiding or information hiding.

a. secure b. private c. static d. masked