A manufacturer uses a moving average to predict how many replacement parts for Part #$8119$ they should produce per month. Past demand is as follows.

$\backslash$table$[[$Month$,$Demand $($units$)],[1302,],[2288,],[3325,],[4401,],[5430,],[6456,]]$

What are the forecasts for month seven using two$-,$ four$-,$ and six$-$period moving averages? What can we learn from the answers?