AID17597: You are the manager of a museum store that sells historical
replicas. The following are the data of actual sales for last 6 years
Year 2014 2015 2016 2017 2018 2019
Actual sale 400 600 500 300 700 500
a. What should be the forecast for 2020 using 3-period moving average
b. When requisite data are not available what options are available to
make a short term forecast? Explain very briefly any one of those methods
explaining the limitations if any.