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.
Installing a Ledger. Learn how to attach the load bearing joist of the deck, called the ledger, to your house. Intro. A ledger is a joist attached to the framing of the house. It carries the weight of the deck and transfers it to the foundation of the house.ut your ledger from the same size lumber as your joists -- 3 inches shorter than the width of the deck so you can attach the end joists to the ends of the ledger. In most cases you will have to remove siding to install the ledger. Prestart Checklist. Time.