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- Practice 2: confidence intervals
Student learning outcomes
- The student will calculate confidence intervals for means when the population standard deviation is unknown.
Given
The following real data are the result of a random survey of 39 national flags (with replacement between picks) from various countries. We are interested in finding a confidence interval for the true mean number of colors on a national flag. Let
the number of colors on a national flag.
X |
Freq. |
1 |
1 |
2 |
7 |
3 |
18 |
4 |
7 |
5 |
6 |
Calculating the confidence interval
Define the Random Variable,
, in words.
the mean number of colors of 39 flags
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Confidence interval for the true mean number
Construct a 95% Confidence Interval for the true mean number of colors on national flags.
Discussion questions
Using the same
,
, and level of confidence, suppose that
were 69 instead of 39. Would the error bound become larger or smaller? How do you know?
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Using the same
,
, and
, how would the error bound change if the confidence level were reduced to 90%? Why?
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Source:
OpenStax, Collaborative statistics. OpenStax CNX. Jul 03, 2012 Download for free at http://cnx.org/content/col10522/1.40
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