# Statistics Ch 3

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 Author: Timmit ID: 258778 Filename: Statistics Ch 3 Updated: 2014-01-27 23:48:37 Tags: Statistics Basics Folders: Description: Statistics Show Answers:

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1. Median If n is an even number (Formula)
(n/2 + (n/2)+1)/2
2. Median If n is an odd number (Formula)
(n+1)/2
3. If the data are skewed, the ___________ is a good measure of central tendency.
Median
4. Population Variance (Formula)
5. Sample Variance
6. Empirical Rule Values
68% 95% 99.7%
7. Population Mean (Formula)
Where xi is the midpoint, xifiis the frequency of the ith class, n is the number of classes.
8. Population z-score (Formula)
z= x-u/sigma
9. Sample z-score (formula)
z=x-xbar/s
10. Determining the kth percentile, Pk
Where k is the percentile of the data value and n is the number of individuals in the data setIf i is an integer, the kth percentile is the ith data value.      If i is not an integer, find the mean of the observations on either side of i.
11. Lower (first) quartile,  Q1
(k=25)
12. Upper (third) quartile, Q3
(k=75)
13. Inter-quartile range: IQR (formula)
Q3-Q1
14. Lower inner fence Formula
Q1 -(1.5 × IQR)
15. upper inner fence Formula
Q3 +(1.5 × IQR)

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