The UV Index provides a daily and hourly forecast of the expected intensity of ultraviolet (UV) radiation from the sun. Some exposure to sunlight is enjoyable. However, too much sun can be dangerous. Overexposure to the sun's ultraviolet radiation can cause immediate damage, such as sunburn, and long-term problems, such as skin cancer and cataracts.
All polls are surveys based on samples drawn from parent populations. A poll's purpose is to make accurate inferences about that population from what is directly learned about the sample through questions the sampled persons answer. Knowledge of the sample is just a means to that end.
The main purpose is to grab people's attention. Once it has achieved that purpose, its next purpose is usually to provide people with information. Sometimes posters are designed to make people curious about something, and encourage them to seek out further information of their own accord. TouchScreen Â· 7 years ago.