Lesson 8-5: Apply
OPEN ENDED Give examples of a biased sample and an unbiased sample. Explain your reasoning.Writing in MathUse the information on page 761 to explain how surveys are used in marketing. Find the margin of error for those who spend $249 or less if 807 mothers were surveyed. Explain what this margin of error means. GET READY for the Lesson
A survey was
Back-to-School Clothes Spending
conducted asking
mothers how much
$249 or less
they spend per student $250-$349
on back-to-school
$350 or more
clothing. The results of
10%
Don’t know
the survey are shown.
20%
When polling
49%
organizations want
to find how the public
21%
feels about an issue,
they survey a small
portion of the
population.
Source: Harris Interactive for Sears, Roebuck
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