Category: Probability & Statistics

In statistics, we want to consider many members of a population at once, as a whole (rather than only one or a few members).  When we take a large enough sample from a population, the central...

Histograms are often used in data analysis and statistics to represent a given set of values.  However, this still raises the question of what exactly a histogram tells us. So, what does a...

It is one thing to calculate a standard deviation from a data set.  However, it is another to interpret it and find out what it is telling you about a data set. So, how do you interpret...

In statistics, we describe data sets using both standard deviation and standard error of the mean (also called standard error).  Although these two terms sound similar, there are some key...

Are you trying to figure out what happens to the mean of a data set when you add or remove a point?  The change in the mean really depends on how the data point relates to the original...

Many of the distributions we work with in real life will be somewhat skewed, without the symmetry that we see in a normal distribution. So, what is a skewed distribution?  A skewed...