1. For a month following a presidential illness, very few homes were sold. Afterwards, the realty business returned to normal levels. This is an example of:

a. Long term trend

b. Random effects

c. Seasonal variation

d. Cyclical variation

2. January, Phil Johnston's newspaper route added two customers who used to subscribe to the evening paper. In February, Phil lost a customer who decided to get his news off the internet. This is an example of:

a. Seasonal variation

b. Random effects

c. Long term trend

d. Cyclical variation

3. The "weights" in the weighted moving average need not:

Select one:

a. Be non negative

b. Sum to 1

c. All be unequal.

d. Give the most recent value the least weight.