a. leanna wants to know what percent of custo...
a. leanna wants to know what percent of customers at her pharmacy would like the pharmacy to sell gift - cards. she puts tear - off questionnaires with this question, along with a deposit box, in the greeting card section.\nb. a cell phone manufacturer wants to know whether a certain model of a cell phone produced on a given day has a defective battery. 10% of that model produced on that day are selected at random and their batteries tested.\nc. rj wants to know if the people in his town believe the town should spend more on community parks. he asks every fifth person who shows up at one of his soccer matches in one of the community parks.
Answer
# Brief Explanations:
a. The sample is from the greeting - card section, likely attracting customers with an interest in gift - giving, not a representative sample of all pharmacy customers, so it's biased.
b. Selecting 10% of the cell phones of a model produced on a given day at random is a fair way to test for defective batteries, so it's unbiased.
c. Asking every fifth person at a soccer match in a community park means the sample is only from people attending that soccer match, not all town residents, so it's biased.
# Answer:
a. Biased
b. Unbiased
c. Biased