Learn about standard error, its role as the standard deviation of a sample, and how it measures the accuracy of a sample being used to represent a population.

When you have the average production of three machines, it is easy to calculate the average or mean production. You just add up the three means and divide by three. But what if I want the average ...

In response to my article, Is the Stock Market Too Concentrated?, which relied upon standard-deviation calculations to assess investment risk, a reader wrote: “My problem [with your argument] is ...

The range for Class 1 is 11 marks, while for Class 2 the range is 17 marks – but does this mean that Class B’s marks are more ...

Rate of return and standard deviation are two of the most useful statistical concepts in business. These two figures will tell you whether a business project is worth the investment and trouble, given ...

When you're trying to estimate the time between the beginning and the end of any project, the critical path follows the longest route. The standard deviation, on the other hand, uses the the most ...

While Excel is useful for many applications, it is an indispensable tool for those managing statistics. Two common terms used in statistics are Standard Deviation and ...