For example, a survey of high school students to measure teenage use of illegal drugs will be a biased sample because it does not include home-schooled students or dropouts. A sample is also biased if certain members are underrepresented or overrepresented relative to others in the population.
It's the biased report because it's only covering one side of the whole story/issue. One side may be extremely against the issue and they'll make sure to say horrible things about the event. Now the other side may be in favor of the event, and they'll only say good things about the event, leaving the bad parts in the shadows.
