Where are the reference speeds, minimum descent altitude, decision height, and barometric altimeter settings entered?

The reference speeds, minimum descent altitude, decision height, and barometric altimeter settings are entered into the Air Data Reference Panel (APR) because this panel is specifically designed to handle various parameters critical for flight operations. The APR allows pilots to input and manage air data settings necessary for the aircraft's performance calculations and safety measures during flight. It serves as a centralized interface for crucial data that the flight crew needs to access and adjust to ensure proper altitude and speed management.

The Control Display Unit primarily serves as a way to interact with systems like the Flight Management Computer but does not specifically focus on entering the types of data mentioned. The Flight Management Computer is responsible for navigation and performance management but relies on information provided by the APR for its calculations. The Navigation Management System typically focuses on positioning and navigation information rather than the specific altitudinal and speed parameters outlined in the question.