Many data analysis software can automatically conduct and display statistical tests on tables. There are two main styles of tests on tables: exception tests and column comparisons. Neither is better in all situations.
Exception tests on tables use arrows, color, or other symbols to indicate which cells on a table are interesting.
Column comparisons use letters to indicate which columns are significantly higher than which others.
Exception tests versus column comparisons
Although there are some problems that are better suited to exception tests and others to column comparisons, in the main the choice of which of these to use is one of personal preference. For more information, see The Relative Strengths and Weaknesses of Column Comparisons Versus Exception Tests on Tables