Why is the calculator giving me a plan different from what I see in the printed tables?

The problem lies in correctly using the tables. We suggest reading the standards carefully, and especially the legend and footnotes at the bottom of the particular table.
One common mistake, when arrows are present in the tables, is not adjusting the sample size according to the arrow. This is just one example.
Using our calculators is a safer alternative to the error-prone usage of the printed standards.