The last four weekly values of sales were 80, 100, 105, and 90 units. the last four forecasts were 60, 80, 95, and 75 units. these forecasts illustrate:

a. bias.
b. slope.
c. trend projection.
d. qualitative methods.
e. adaptive smoothing.

BIAS FORECAST

Explanation:

BIAS FORECAST

Bias forecast is that type of forecast that generate the same difference in value as previous obtained value .

if the obtained value is greater than original value then forecast is positive  and if the obtained value (forecast) is less than the original value then it is said to be negative.

in the above case the given forecast is negative bias forecast

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answer; 33,000;