Calculate your T-Value by taking the difference between the mean and population mean and dividing it over the standard deviation divided by the degrees of freedom square root.

Learn how to find the square and square root of a number or digit in Excel. Use formula calculate the square and square root.

Parentheses: Controlling the Order of Operations Parentheses—or rounded brackets—are used in Excel to define the order in which calculations are performed.

Percentages aren't always easy to calculate, but one of the best tools in Excel's toolbox is calculating percentages for you. Here's how to do it.

Learn how to calculate the net present value (NPV) of your investment projects using Excel's XNPV function.

Calculating the return One of the best methods for calculating an average return for a stock investment is the XIRR function in Excel.