12. you want to find students' opinions on the current attendance policy. give two
ways that your sample for the survey might be selected. the first must be an
example of a biased sample and the second must be an example of an unbiased
sample. thoroughly explain your answers.
13. two toothpaste manufacturers each claim that 4 out of every 5 dentists use
their brand exclusively. both manufacturers can support their claims with survey
results. explain how this is possible.
14. a survey about americans' interest in soccer, asks the question "how
interested are you in the world's most popular sport, soccer? " give two ways
your sample for the survey might be selected. the first must be an examp
biased sample and the second must be an example of an unbiased sample.