MATH 221 Week 5 Discussion Post

WEEK 5: CONFIDENCE INTERVAL
CONCEPTS
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Look in the newspapers, magazines, and other news sources for results of a survey or
poll that show the confidence interval, usually shows as a +/- some amount. Describe
the survey or poll and then describe the interval shown. How does knowing the interval,
rather than just the main result, impact your view of the results?
This topic was locked Oct 8 at 11:59pm.
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Collapse SubdiscussionIlina Grantcharova
Ilina Grantcharova
Sep 29, 2018 Sep 29 at 6:17pm
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Class, let’s start this discussion with a definition of confidence interval for a
population mean.
o

Collapse SubdiscussionCharlene Ruffin
Charlene Ruffi n
Oct 1, 2018 Oct 1 at 11:16am
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Class, let’s start this discussion with a definition of confidence interval for a
population mean.
According to our lesson confidence intervals are poll results in the news, you often
see +/- 3% at the bottom. If polls come out to 20% with +/- 3% the interval would be
17% to 23%.
So, a 95% confidence interval means that if we took 100 samples of the same size
from the same population, 95 of those confidence intervals would encompass the
TRUE population.
However, there is a 5% chance that the confidence interval we created does not
include the TRUE population mean.




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