Math Connects Course 2: 8-3F Unbiased and Biased Samples Answer Guide
4. The conclusion is valid. This is an
unbiased systematic random sample.
15. F
16. about 292 students
5. The conclusion is not valid. This is a
biased convenience sample, since only
the art club members were surveyed.
6. The conclusion is not valid. This is a
biased sample, since only voluntary
responses are used.
7. The conclusion is valid. This is an
unbiased, simple random sample.
8. This is a systematic random sample.
So, the sample is valid; about 302
people.
9. This is a simple random sample. So
the sample is valid; about 205 people.
10a. The kids in the lunch room
10b. Sample answer: It is a random
sample and they are the correct age.
11. Sample answer: If the questions are
not asked in a neutral manner, the people
may not give their true opinions. For
example, the question “Your really don’t
like Brand X, do you?” might not get the
same answer as the question “Do you
prefer Brand X or Brand Y?” Also, the
question “Why would anyone like rock
music?” might not get the same answer
as the question “What do you think
about rock music?”
12. Multiple answers possible.
13. Sample answer: A survey uses an
actual sample to predict the results in a
population.
14. D
17. 16 pizzas