Problem:
What is the forecast for the Period 7 using a 3-period weighted moving average technique (use a weight of 3 for last period's value, a weight of 2 for the period before, and a weight of 1 for the period before that), given the following time-series data for six past periods?
Period 1 2 3 4 5 6
Value 136 126 146 148 156 164
i) 126.50
ii) 156.67
iii) 158.67
iv) 148.07
v) 164.00
Solve the problem and show all work.