Life Expectancy
An actuary wanted to develop a model to predict how long individuals will live.After consulting a number of physicians,she collected the age at death (y),the average number of hours of exercise per week (x1),the cholesterol level (x2),and the number of points that the individual's blood pressure exceeded the recommended value (x3).A random sample of 40 individuals was selected.The computer output of the multiple regression model is shown below. THE REGRESSION EQUATION IS y = 55.8 + 1.79x1− 0.021x2− 0.061x3 
S = 9.47 R−Sq = 22.5% ANALYSIS OF VARIANCE 
-{Life Expectancy Narrative} Interpret the coefficient b1.
Definitions:
Quantity
The amount or number of a material or immaterial good that can be measured or quantified.
Quality
A measure of how good or suitable something is in comparison to similar items or services.
Seigniorage
Seigniorage is the profit made by a government by issuing currency, especially the difference between the face value of coins and their production costs.
Medium Of Exchange
An intermediary instrument, such as money, used to facilitate buying and selling goods and services.
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