Which best describes bias, if any, from the sample surveyed?
survey: favorite vacation locations
sample: randomly selected visitors to a national park
a.
since the sample is randomly selected, there is unlikely to be any bias.
b.
since the people surveyed are visiting a national park, they may be biased against vacations close to home.
c.
since the people surveyed are visiting a national park, they may be biased towards national parks.
d.
since a large number of people visit national parks, the sample should be large enough to eliminate any bias.