# Statistics Ch 2

Home > Preview

The flashcards below were created by user firefly501 on FreezingBlue Flashcards.

1. Measures of center
mean & median
2. Mean
• symmetrical distribution, arithmetic average, influenced by skew and outliers
• For symmetrical distribution, the mean and median will be the same
3. Median
skewed distribution , midpoint of a distribution, resistant to skew and outliers

For skewed distribution, the mean is influenced by extreme observations
Quartiles & Standard Deviation
5. Quartiles
skewed distribution
6. First Quartile
value in the sample that has 25% of the data at or below it
7. Third Quartile
value in the sample that has 75% of the data at or below it
8. Interquartile range
(IQR) = Q3 - Q1
9. Outlier
an individual value that falls outside the overall pattern.
10. Low outlier:
any value < (Q1 – 1.5 IQR)
11. High outlier
any value > (Q3 + 1.5 IQR)
12. Standard Deviation
• (s) – symmetrical distribution
• Variation around the mean, how spread out from the mean the data is
• When s = 0 : no spread in the data
• As s increases, the data is more widely spread around the mean
13. Statistical Summary
Symmetrical distribution & Skewed distribution
14. Symmetrical distribution
mean and standard deviation
15. Skewed distribution
• five number summary, boxplot
• [Minimum, Q1, M, Q3, Maximum]

### Card Set Information

 Author: firefly501 ID: 137591 Filename: Statistics Ch 2 Updated: 2012-02-26 00:10:36 Tags: statistics Folders: Description: Describing Distributions with Numbers Shape, spread, center Show Answers:

What would you like to do?

Home > Flashcards > Print Preview