lecture+5

# lecture+5 - [LECTURE 5 What you need to remember for...

This preview shows pages 1–3. Sign up to view the full content.

January 18, 2008 [ LECTURE 5 ] What you need to remember for today’s lecture? 1. IQR and outliers The interquartile range (IQR) is the distance between the first and third quartiles (the length of the box in the boxplot) IQR = Q 3 - Q 1 An outlier is an individual value that falls outside the overall pattern. Question: How far outside the overall pattern does a value have to fall to be considered an outlier? i. Low outlier: any value < Q 1 – 1.5 IQR ii. High outlier: any value > Q 3 + 1.5 IQR What you need to know for today’s lecture? 1. Analysis & Discussion of Mean and Median The mean is a useful indicator and measurement of center, but its practical applications are limited; on the other hand, the median sometimes gives more meaningful inference. Here are some examples. i. When the distribution is not wildly irregular, A single numerical summary (typically would be the mean) here would not make sense

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
January 18, 2008 [ LECTURE 5 ] ii. The occurrence of outliers. When outlier occurs, the outcome of mean would be
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 06/24/2008 for the course MATH 1070 taught by Professor Akbas during the Summer '08 term at Georgia State.

### Page1 / 4

lecture+5 - [LECTURE 5 What you need to remember for...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online