11-7 Solve It!
This is a good
sample problem!
One day, you catch 100 fish at random from
a lake. You tag the fish and then release
them back into the lake. The next day you
again catch 100 fish at random, as shown
on the map. The red dots indicate the fish
that have your tags. What can you conclude?
Justify your conclusion.
11-7 Lesson Quiz
1. Identify the sampling method used and any bias the sample
might have: A survey is taken by the student council of the
first twenty students buying lunch in the cafeteria to see
whether students think the cafeteria lunch is a good value.
2. What if any bias is in this survey question: Don’t you think
that not taking the bus is irresponsible?
3. Do you UNDERSTAND? The student council is considering
petitioning the school board for permission to change the
school colors. What sampling method could you use to find
the percent of students who would favor a change of school
colors? What survey question would you ask to avoid bias?
Answers
Solve It!
Lesson Quiz
There are about 3333
fish in the lake. You can
estimate that for every 3 fish
you tagged, there are 97
additional fish. 100
3 5 33.3 and
33.3 3 100 5 3333.
1. convenience sample; people
who are eager for lunch may
be overrepresented
2. Samples: double negative,
this may cause confusion;
leading, suggests not take
the bus is irresponsible
3. Ask every tenth student in
the alphabetical directory for
a systematic sample. A good
survey question would be,
“Would you favor a change
in school colors?”
Prentice Hall Algebra 2 • Solve It/Lesson Quiz on Transparencies
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