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# 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 SARALEMAIL: [email protected]

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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 specificvalue?»

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 aspecific 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 NumericallyCentral 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

2.1Measures 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

MeanPopulation mean,