Example 7.12: The following forecasting equation has been derived by a least-squares method: ŷ =10.27 + 1.65x (Base year:1992; x = years; y = tonnes/year) Rewrite the equation by (a) shifting the...

Only a?

Extracted text: Example 7.12: The following forecasting equation has been derived by a least-squares method: ŷ =10.27 + 1.65x (Base year:1992; x = years; y = tonnes/year) Rewrite the equation by (a) shifting the origin to 1997. (b) expressing x units in months, retaining yn tonnes/year. (c) expressing x units in months and y in tonnes/month.