Over an 18-month period, sales have been found to have an underlying linear trend of y = 7.112 +3.949x, where y is the number of items sold and x represents the month. Monthly deviations from trend have been calculated and month 19 is expected to be 1.12 times the trend value.What is the forecast number of items to be sold in month 19?
A、91
B、92
C、93
D、94
A、91
B、92
C、93
D、94
【参考答案及解析】
y=7.112 + 3.949xIf x =19, trend in sales for month 19 = 7.112 + (3.949 x 19) =82.143 Seasonally-adjusted trend value =82.143 x 1.12 =92If you failed to select the correct option, rework the calculation carefully. You shouldn't have too much trouble with this question since it is just a matter of plugging in a value for x into the equation given in the question.
y=7.112 + 3.949xIf x =19, trend in sales for month 19 = 7.112 + (3.949 x 19) =82.143 Seasonally-adjusted trend value =82.143 x 1.12 =92If you failed to select the correct option, rework the calculation carefully. You shouldn't have too much trouble with this question since it is just a matter of plugging in a value for x into the equation given in the question.