A Stem & Leaf diagram is a way of representing data in a tabular format. The left section of the diagram is called the ‘STEM’ and the […]More…

# Category: Statistics

# Box Plots

Box plots are used to represent the 5 data items listed below graphically, which are: Lowest value in the dataset Lower Quartile (LQ) Median Upper Quartile (UQ) […]More…

# Range vs. Interquartile Range

Both the ‘Range’ and ‘Interquartile Range’ measure the spread of our data set. That is they both tell us how spread out our data set is; so […]More…

# Statistics – Mean, Median, Mode and Range

In data analysis, there are 3 types of ‘Average’; which are Mean, Median and Mode, and one which measures the ‘Spread’, which is the Range. The below […]More…

# Frequency Polygons

A frequency polygon is a line graph that is based on a frequency table. Frequency polygons are similar to histograms. Here is an example below.

# Completing a Cumulative Frequency Table

Completing a Cumulative Frequency table is a simple exercise. This is done by simply performing some addition on the data you are given. Here are a couple […]More…

# Part (I) – Quartiles & Interquartile Range

If you have a data set, you can be asked to provide 4 measurements on this data. These are: Lower Quartile (Q1), Median (Q2), Upper Quartile (Q3) […]More…