NO.PZ201709270100000506
问题如下:
6. Based on the regression output in Exhibit 3 and sales data in Exhibit 4, the forecasted value of quarterly sales for March 2016 for PoweredUP is closest to:
选项:
A.
$4.193 billion.
B.
$4.205 billion.
C.
$4.231 billion.
解释:
C is correct. The quarterly sales for March 2016 is calculated as follows:
beginarraylln Salest-ln Salest-1=b0+b1(ln Salest-1-ln Salest-2)+b2(ln Salest−4-ln Salest-5)ln Salest−ln3.868=0.0092−0.1279(ln3.868−ln3.780)+0.7239(ln3.836−ln3.418)ln Salest=1.44251Salest=e1.44251=4.231
为什么t-statics不合格的系数也会被放进公式,b0和b1的t检验就过不了啊