The top row of buttons in this DC hotel elevator from left to right: cancel call, emergency call button, and a key hole for turning off the alarm. What does the prime top-left positioning of the call cancel button say about the frequency with which users accidentally press the alarm button?

How long does it take for a false alarm button presser to realise that the wrong button has been pressed? What does this say about the likely first response of the, hmm, first responders when the alarm is initially pressed?