The number of plumbing repair jobs performed by Augur's Plumbing Service in each of the last three months is listed below:
Time Period Demand
4 years ago 41
3 years ago 45
2 years ago 49
1 year ago 55
a. What is this year's forecast using a weighted moving average with the weights equal to .5, .3, .2?
b. What is this year's forecast using the linear trend (regression approach)?