[Solution] The sales, in billons of dollars, of Keller Overhead Door, Inc. for 1998 to 2003 are: Year Sales Year Sales 1998 7.45 2001 7.94 1999 7.83 2002
Question: The sales, in billons of dollars, of Keller Overhead Door, Inc. for 1998 to 2003 are:
| Year | Sales | Year | Sales |
| 1998 | 7.45 | 2001 | 7.94 |
| 1999 | 7.83 | 2002 | 7.76 |
| 2000 | 8.07 | 2003 | 7.90 |
- Plot the data
-
Determine the least squares trend equation
Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Intercept -101.345 99.0584932 -1.023083833 0.3641045 -376.37618 173.6858953 Year 0.054571 0.04951685 1.102077966 0.3322796 -0.0829097 0.192052527
The trend equation is
\[\widehat{Sales}=-101.345+0.054571\,t\] - Use the trend equation to calculate the points for 2000 and 2002. Plot them on the graph and draw the regression line.
- Estimate the net sales for 2006
- By how much have sales increased or decreased per year on the average during the period?
Deliverable: Word Document 
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