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
老师好 这题 为啥b0, b1可以用0.0092 and -0.1279? 不是b0's t-statistic of 1.0582 t critical value of -2.03, 不拒绝原假设 b0, b1 = 0说明b0 , b1 都应该等于0 的?