Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Signal detection outcomes based on the presence or absence of shark analogues, visual ‘noise’ and the response of lifeguards.
| Shark analogue present | Lifeguard response | Outcome | ||||
|---|---|---|---|---|---|---|
| Yes | + | Noise | + | Positive | = | Detection |
| Yes | + | Noise | + | Negative | = | Miss |
| No | + | Noise | + | Positive | = | False alarm |
| No | + | Noise | + | Negative | = | Correct rejection |
