The average remaining lifetimes for women of various ages in a certain country are given in the following table.† (A graphing calculator is recommended.)

Question

Average Remaining Lifetimes for Women
Age (x) Years (y)
0 79.2
15 65.5
35 46.1
65 20.2
75 12.2
(a)
Find the equation of the least-squares line for the data. (Round all numerical values to two decimal places.)
ŷ = -.90x+78.71

(b)
Use the equation from part (a) to estimate the remaining lifetime (in years) of a woman of age 29. (Round your answer to the nearest year.)
53 yr
(c)
Is the procedure in part (b) an example of interpolation or extrapolation?

Answer 1

Extrapolation