Concept explainers
(a)
To calculate: The logarithmic regression model of the form
Year t (year since 1900) |
50 |
60 |
70 |
80 |
90 |
100 |
110 |
Percentage P over 85(%) |
0.4 |
0.5 |
0.7 |
1 |
1.2 |
1.6 |
1.9 |
(b)
The number of significant digits reflected by the percentage of population of age over 85 in U.S. in 2020.
(c)
The correct statement form the following options if A is increases by 0.1 and decrease C by 0.1 in the logarithmic model then,
(A) The new model predicts eventually lower percentage.
(B) The long term prediction is essentially the same.
(C) The new model predicts eventually higher percentages.
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