BBA182 Applied Statistics Week 3 (2) Using numerical data to describe data
Using numerical measures to describe data
Using numerical measures to describe data
Is the data centered around a specific value?
Numerical measures to describe data
Measures of the center of the data set
Mean Population mean, μ
Mean Sample Mean, x ̅
The Mean symmetry and unimodal distribution
Mean
Mean
Skewed distribution
Median
Finding the Median
Finding the Median
Finding the median
Finding the median
Mode
Measures of the center summary data
Measures of the center summary data
When is which measure of the center the “best”?
Shape of a Distribution Describe the shape of a distribution
Histogram of annual salaries (in $) for a sample of U.S. marketing managers:
Class exercise
Solution to class exercise
Measures of variability
Measures of Variability
Quartiles
Quartiles
How to calculate quartiles manually
Quartiles
Quartiles
Quartiles and Enron case
Range
Range – Example Enron case
Disadvantages of the Range
Disadvantages of the Range
Range: short-comings as a good measure for variability
Interquartile Range
Interquartile Range
Interquartile Range
Enron data: Interquartile range
895.06K
Категория: МатематикаМатематика

Using numerical measures to describe data. Measures of the center. Week 3 (2)

1. BBA182 Applied Statistics Week 3 (2) Using numerical data to describe data

DR SUSANNE HANSEN SARAL
EMAIL: [email protected]
HT TPS://PIAZZA.COM/CLASS/IXRJ5MMOX1U2T8?CID=4#
WWW.KHANACADEMY.ORG
DR SUSANNE HANSEN SARAL
1

2. Using numerical measures to describe data

«Is the data in the sample centered or located around a specific
value?»
First question that business people, economists, corporate executives, etc. ask
when presented with sample data.

3. Using numerical measures to describe data

The histogram gives an idea whether the data is centered around a
specific value.
The histogram provides a visual picture of how the data is distributed
(symmetric, skewed, etc.)

4. Is the data centered around a specific value?

5. Numerical measures to describe data

Describing Data Numerically
Central Tendency
Variation
Mean
Range
Median
Interquartile Range
Mode
Variance
Standard Deviation
Coefficient of Variation
COPYRIGHT © 2013 PEARSON EDUCATION, INC. PUBLISHING AS PRENTICE HALL
Ch. 2-5

6. Measures of the center of the data set

2.1
Measures of the center of the data set
Measures of Central
Tendency
Mean
Median
Mode
n
x
x
i 1
i
n
Arithmetic
average of the
data
Midpoint of
ranked/ordered
values in the data
Most frequently
observed value in the
data
(if one exists)
COPYRIGHT © 2013 PEARSON EDUCATION, INC. PUBLISHING AS PRENTICE HALL
Ch. 2-6

7. Mean Population mean, μ

Mean
Population mean,
English     Русский Правила