Question

populations, samples and hypothesis
this quiz will test your knowledge on populations, samples and hypothesis.
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value: 2
toby randomly interviewed 70 patrons at a country music concert to determine their favorite type of music. based on the results of his survey, he made the following claim.
two out of three concert - goers prefer country music.
which of the following statements best describes why this is not a valid claim?
o a. only people on the floor level were surveyed.
o b. toby only surveyed patrons at a country music concert who are probably biased toward country music.
o c. not enough patrons at the concert were surveyed.
o d. the concert - goers were not randomly surveyed.

Explanation:

Toby surveyed patrons at a country - music concert. These patrons are likely to have a preference for country music already, which means the sample is biased. A valid claim about all concert - goers' music preferences can't be made from this biased sample.

Answer:

b. Toby only surveyed patrons at a country music concert who are probably biased toward country music.