Question

More on the Leaning Tower of Pisa. Refer to the previous exercise. (a) In 1918 the lean was 2.9071 meters. (The coded value is 71.) Using the least-squares equation for the years 1975 to 1987, calculate a predicted value for the lean in 1918. (Note that you must use the coded value 18 for year.)

Answer 1

2.9106

Explanation:

According to the information of the problem

Year 75 76 77 78 79 80 81 82 83 84 85 86 87

Lean 642 644 656 667 673 688 696 698 713 717 725 742 757

If you use a linear regressor calculator you find that approximately

`y = 9.318 x - 61.123`

so you just find
`x = 18` and then the predicted value would be 106mm

therefore the predicted value for the lean in 1918 was 2.9106