Sessions 2 and 3 explored different ways to organize data in order to draw out patterns in the variation. In these sessions, we investigated a variety of approaches to organizing data in graphs and tables and examined some of the different ways we can answer statistical questions, based on these representations.

In this session, we will explore how dividing data into groups can give us yet another way to answer statistical questions. Note 1

The goal of this session is to learn how dividing data into groups can help us provide other types of answers to statistical questions. In this session, you will learn how to do the following:

Understand the median as the value that divides the ordered data into two groups, with the same number of data values (approximately one-half) in each group

Understand quartiles as the values that divide the ordered data into four groups, with the same number of data values (approximately one-fourth) in each group

Investigate the concept of quartiles using several different representations

Summarize an entire data set with a Five-Number Summary

Summarize an entire data set with a box plot

Throughout the session you will be prompted to view short video segments. In addition to these excerpts, you may choose to watch the full-length video of this session.

Previously Introduced:

New in This Session:

interval
median
mode

box plot
Five-Number Summary
interquartile range
midrange
quartiles
summary measures
Three-Number Summary
Two-Number Summary

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Session 4: Index | Notes | Solutions | Video