Data Validation
Using data validation tools prevents users from inputting bad data, but not from pasting it.
Go to the Data Menu, in the Data Tools group, select Data Validation.
Excel Names
Using excel names that are usable in formulas makes formulas easier to understand.
Use names to reference one cell or an array.
Excel names simplify references to other worksheets.
Calculation Formula Rules
Keep them short.
Add a sentence explaining what a block of formulas is doing.
They should only reference cells on the same worksheet or names ranges on (same or other) worksheets.
They should not include "raw inputs."
Creating Histograms using Data Analysis Toolpak
To Install the Data Analysis Toolpak:
Go to File>Options>Add-Ins>Select Analysis Toolpak>Go down to Manage "Excel Add-ins" and hit Go>Check the box next to Analysis Toolpak and hit Ok
To Create a Histogram:
Go to Data Ribbon>Analysis Panel>Data Analysis (Above Solver)
Input Range: Select data including header
Bin Range: Select data including header
Output Range: Select a cell or "new worksheet" for the output
Refining your Histogram:
Delete the "More" at the bottom of the newly created data to remove it from the histogram.
Right click on data series and select "Format Data Series." You can adjust the gap width.
Go to Chart Tools>Format>Update the Shape Color, etc...