An experiment was performed on a certain metal to determine if the strength is a function of heating time.The simple linear regression equation is = 1 + 1X.The time is in minutes and the strength is measured in pounds per square inch. Provide a managerial interpretation of the Y-intercept.
A)As time heated increase by one minute,the strength increases by 1lb.per sq.inch.
B)This is the direct relationship between X and Y.
C)If the metal is not heated,the estimated average metal strength is 1lb.per sq.inch.
D)Y-intercept cannot be interpreted.

Question

An experiment was performed on a certain metal to determine if the strength is a function of heating time.The simple linear regression equation is  = 1 + 1X.The time is in minutes and the strength is measured in pounds per square inch. Provide a managerial interpretation of the Y-intercept.
A)As time heated increase by one minute,the strength increases by 1lb.per sq.inch. 
B)This is the direct relationship between X and Y. 
C)If the metal is not heated,the estimated average metal strength is 1lb.per sq.inch. 
D)Y-intercept cannot be interpreted.

Quizplus · Accepted Answer

The Y-intercept of 1 in the regression equation means that when heating time (X) is zero, the estimated average metal strength (Y) is 1 pound per square inch.

An Experiment Was Performed on a Certain Metal to Determine