While standard deviation is the square root of the variance, variance is the average of the squared difference of each data point from the mean.

This tutorial shows you how to insert an Arrow symbol in a Word document via AutoCorrect, Shortcuts, Keyboard, and Symbols.

Learn how to add or insert an emoji or symbol in the email subject line or body of Outlook. The Emoji Panel & Character Map can let you add the picture or charcater.

How to Make a Drop-Down List to Choose a Date in Excel. Microsoft Excel lets you create simple forms that your users can enter data. To save them time and make sure you get the information you ...

How to calculate return on investment (ROI), the money an investment made relative to its cost, in Microsoft Excel.

Valerian root is an herbal supplement that can improve sleep and ease tension headaches. It’s also been shown to reduce anxiety and depression.