In descriptive statistics, the interquartile range (IQR) is a measure of statistical dispersion, which is the spread of the data. The IQR may also be called the midspread, middle 50%, fourth spread, or H‑spread. It is defined as the difference between the 75th and 25th percentiles of the data. To calculate the IQR, the data set is divided into quartiles, or four rank-ordered even parts via linear interpolation. These quartiles are denoted by Q1 (also called the lower quartile), Q2 (the median), and Q3 (also called the upper quartile). The lower quartile corresponds with the 25th percentile and the upper quartile corresponds with the 75th percentile, so IQR = Q3 − Q1. The IQR is an example of a trimmed estimator, defined as the 25% trimmed range, which enhances the accuracy of dataset statistics by dropping lower contribution, outlying points. It is also used as a robust measure of scale It can be clearly visualized by the box on a Box plot. (Wikipedia).
Statistics - Compute the interquartile range
This video shows how to compute the interquartile range for a set of data. Remember to reorganize the data so that you can find the median values easier. For more videos visit http://mysecretmathtutor.com
From playlist Statistics
How to Find the Interquartile Range of a Set of Data | Statistics
How do you find the interquartile range of a set of data? What is the interquartile range? In this video we go over an example of finding the interquartile range (IQR), or inter-quartile range if you prefer it hyphenated. We define interquartile range as well, if you're into that sort of t
From playlist Statistics
Find the Interquartile Range with Odd Data Set | Statistics
How do you find the interquartile range of an odd set of data, as in a set with an odd number of data points? What is the interquartile range? In this video we go over an example of finding the interquartile range (IQR) with an odd set of data, or inter-quartile range if you prefer it hyph
From playlist Statistics
Find the Interquartile Range with Even Data Set | Statistics
How do you find the interquartile range of an even set of data, as in a set with an even number of data points? What is the interquartile range? In this video we go over an example of finding the interquartile range (IQR) with an even set of data, or inter-quartile range if you prefer it h
From playlist Statistics
Statistics: Ch 2 Graphical Representation of Data (53 of 62) The Interquartile Range
Visit http://ilectureonline.com for more math and science lectures! We will learn and see an example of what is the interquartile range. To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 . Next video in this series can be seen at: https://youtu.be/kiv
From playlist STATISTICS CH 2 GRAPHICAL REPRESENTATION OF DATA
Chapter 6 - Interquartile Range (IQR) - IB Math Studies (Math SL)
Hello and welcome to What Da Math This video is an introduction to interquartile range and spread distribution of statistical data from Chapter 6 of Haese edition of IB Math Studies book. SUBSCRIBE for more math and math studies videos Join me on Twitter: http://twitter.com/WhatDaMath
From playlist IB Math Studies Chapter 6
How To Find The Interquartile Range & any Outliers - Descriptive Statistics
This descriptive statistics video tutorial explains how to find the interquartile range and any potential outliers in the data. You need to calculate the first and third quartiles in order to calculate the IQR. Q1 is the median of the lower half of the data and Q3 is the median of the up
From playlist Statistics
The Range & Interquartile Range – Two Simple Measures of Variability (6-2)
We will begin with two simple measures of variability: the range and the interquartile range. Range is the variability between the two most extreme scores in the distribution. It is the difference between the largest and smallest scores. Outliers can affect the range, but not the interquar
From playlist WK6 Measures of Variability - Online Statistics for the Flipped Classroom
Box Plots (box and whisker diagrams) - GCSE Maths Exam Questions
GCSE Maths Box plots (box and whisker diagrams) maths exam question practice taken from past papers and practice papers. Keywords: box plot, box and whisker diagram, median, interquartile range, quartile, graph, upper quartile, lower quartile, q1 ,q2 ,q3 Help revise for the 8300 new spe
From playlist GCSE Maths Exam Question Compilations
IQR vs Range (interquartile range vs range) | Statistics
We compare the interquartile range of a set of data and the range of a set of data. We'll see how the range is much more sensitive to extreme values and outliers, since it is defined as the max minus the min. The IQR, on the other hand, since it is the range of the middle half of the data,
From playlist Statistics
Year 12/AS Statistics Chapter 3.1 (Representations of Data)
This lesson introduces representing data for A-Level! We take a look at what is meant by anomalies and outliers, and introduce some techniques to define an outlier with some worked examples. Later on we return to boxplots from GCSE and show how to add outliers to box plots, as well as how
From playlist Year 12/AS Edexcel (8MA0) Mathematics: FULL COURSE
How to find the range and interquartile range for a data set at GCSE
From playlist Mr Arnold's Unit 1 Higher Revision
Determine Five-Number Summary, Outliers, and Create a Box Plot on (Even)
This video explains how to determine the five number summary, range, interquartile range, and outliers of a data set as well as create a box plot by hand. http://mathispower4u.com
From playlist Statistics: Describing Data
This video is about the Measures of Variation
From playlist Statistical Measures
How to find the interquartile range using a TI 83.
From playlist TI 83 for Statistics