During halftime of a college football game, the university president has the announcer ask fans to go to section 429 if they are interested in filling out a survey about the cleaniness of restrooms at the stadium. On a scale from 1 (disgusting) to 10 (spotless), the mean rating was 2.2. Explain how using a random sample helps avoid bias created by the method described in the problem. Why is this important? With the voluntary response sample, fans who are disgusted by the restrooms are more likely to be included in the sample. With a random sample, each fan in attendance has the same chance to be included in the sample. This allows the university president to draw an unbiased conclusion about the cleanliness of the restrooms in the stadium. With a random sample, fans who are disgusted by the restrooms are more likely to be included in the sample. With the voluntary response sample, each fan in attendance has the same chance to be included in the sample. This allows the university president to draw an unbiased conclusion about the cleanliness of the restrooms in the stadium