The data in the table below are the result of a random survey of 39 national...
The data in the table below 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 X = the number of colors on a national flag.
| x | Freq |
| 1 | 1 |
| 2 | 7 |
| 3 | 18 |
| 4 | 7 |
| 5 | 6 |
Define the random variable Xbar in words
What is Xbar estimating?
Is the starndard deviation known?
Homework Answers
is the average number of colors on a national flag.
= 
X * f /
f
= ( 1 * 1 + 2 * 7 + 3* 18 + 4 * 7 + 5 * 6 ) / 39
= 3.2564
Standard deviation is not known.
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The data in the table below are the result of a random survey of
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NOTE: If you are using a Student's t-distribution, you may
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