A nuclear power plant replaces its ID card facility access system cards with a biometric security system

Question:

A nuclear power plant replaces its ID card facility access system cards with a biometric security system that scans the iris pattern of the employee and compares it with a data bank. Users are classified as authorized or unauthorized.
(a) State the null and alternative hypotheses.
(b) De ne Type I and II error. What are the consequences of each?