Chapter 10, Problem 25E

To determine

To construct: the model to predict future increases in life expectancy.

Explanation of Solution

Given:

Decade	Life Exp.
1	48.6
2	54.4
3	59.7
4	62.1
5	66.5
6	67.4
7	68
8	70.7
9	72.7
10	74.9

Graph:

Scatter Plot:

  

Data analysis

Data > Data analysis > Regression

Step 1. Enter data in excel spreadsheet

Step 2. Click on Data > Data analysis > Regression.

Step 3. Select input Y and X range

Step 4. Click Ok

This is the obtained output

  

Calculation:

The regression is from the output is

  $Interval=2.657duration+49.887$

R-squared value of 0.9361 or 93.61 percent represents that 93.61 percent variation in the interval could be accounted for by duration. Therefore, it could be said that the predictions on the basis of this would be good.