The expected numbers (under the null hypothesis) in each cell are equal to. Thus for the introvert/red cell the expected number is. To calculate the chi-squared (c2) statistic the value of. needs to be calculated for each cell in the table.
Ledger Board Definition. A ledger board is a horizontal lumber beam attached to an existing wall and used to tie in construction elements such as porch roofs and decks. A deck ledger is installed as part of the deck frame construction. The frame is then attached at either end, with the deck joists butting up to it.
The ledger board is one of the most critical parts of your new deck. It attaches to the house and acts as the main support for the part of the deck that you walk out onto from your door as well as a reference point for laying out the remainder of your deck area.tep 6 - Remove the Ledger Board. Remove the ledger board from the house then and squeeze and apply silicone caulk into each pre-drilled hole. The silicone will act as a moisture seal for the areas where lag bolts are inserted.