Statistics

Categorical Data II (collecting and displaying)

Numerical Data (Collecting and Displaying)

Two Categorical Variables

Create and interpret dot plots I

Create and interpret dot plots II

Create and interpret line graphs (real life)

Create and Interpret Scatterplots

Data Collection Investigation

Methods for Data Collection (Investigation)

Questioning in data collection (Investigation)

Collecting Data - A personal investigation

Create and interpret graphs involving time

Create and interpret frequency tables

Practicalities of Obtaining Data (investigation)

Create and interpret stem and leaf plots

Statistical Displays - A review

Interpret sector graphs

Real Life Data - Misleading Graphs

Dodgy pie charts (Investigation)

Cropped Graphs (Investigation)

Graphs not to scale (Investigation)

Misleading pictograms (Investigation)

Graphs with broken axes (Investigation)

Real Life Data - Opinion Polls (Investigation)

Statistics and the weather (Investigation)

Number of Observations

Recognising the centre of data

Recognising the spread of data

Recognising the shape of data

The problem with average (Investigation)

Mean, median mode and range (calculation from graphs and charts)

Mean, median mode and range (find missing data)

Mean, median mode and range (comparing data sets)

Mean, median, mode and range (combined set)

Write your own maths test (Investigation)

How the shape affects choice of centre and spread

Where is the centre? (Investigation)

Frequency Tables and Grouped Data

Statistics on grouped data

Identify Outliers

Effects of Outliers

United Kingdom England

Key Stage 3

Recognising the spread of data

Lesson

We've already learnt about the range, which is a measure of spread in a data set. Once we are able to calculate the range in a data set, we can start to compare and make judgments about different data sets and potentially spot any outliers.

Now let's compare the spread of some data sets and graphs.

Worked Examples

Question 1

Look at the data sets below. Which data set has the largest range?

$101,105,118,129,136$101,105,118,129,136
A
$19,23,25,28,29$19,23,25,28,29
B
$22,25,43,64$22,25,43,64
C
$104,107,113,120,125$104,107,113,120,125
D

QUESTION 2

Do the dot plots shown have the same range?

Yes
A
No
B

What is Mathspace

About Mathspace