Instructions for Nomograph:
Step 1 is to choose the accuracy of the study. Click the radio button (2.0%, 3.0%, 4.0%, 5.0%) in the middle column

Step 2 is to click the approximate probability on the left column that the activity you are studying will occur (to get
this right you might want to start the study to see actually how often the activity occurs).

Step 3 is to read off the number of observations on the right line from 100-10,00