Stem and leaf diagrams
In this article we shall explore the steam and leaf diagrams. A stem and leaf diagram can be used to order or present data given to two or three significant figures. Each observation is...
Category: statistics
Standard deviation and variance
In this article we shall explore two important measures of dispersion in statistics. The standard deviation and variance for discrete data. Below is a list of notes covered in this article.
Range and Quartiles
In this article we shall explore range and quartiles. Below is a quick summary of what is covered in this article. Summary Range of set of data is the difference between the highest and...
Percentiles
This article explores percentiles. Percentiles split the data into 100 parts. A percentile (or a centile) is a measure used in statistics indicating the value below which a given percentage of collected data fall....
Mode, median, mean
In this article we shall explore the three measures of location used to describe the centre of a set of data, the mode, median, and mean. We can use the measure of location to...
Frequency tables and grouped data
This article explores grouped data, frequency tables and how to construct them. When you have a very large amount of data especially where the variables repeat you can simplify the data by using frequency...
Mode of a continuous random variable
This article is a continuation from the previous article. It may be a good to read through it before attempting this article. This article explores the mode of a continuous random variable. The mode...
Median of a continuous random variable
This article is a continuation from the previous article. It may be a good idea to go through it before attempting this article; If X is a continuous random variable with cumulative density function...
Probability density mean and distribution
This article is a continuation from the previous random variables article. This article covers mean and variance of a probability density function. First we shall discuss a few key points before actually looking at...
Cumulative distribution function
This article is a continuation from the previous continuous random variables article. It may be a good idea to read through it before attempting this section. This article covers cumulative distribution for continuous random...