A rocket motor is manufactured by bonding together two types of propellants, an

Question

A rocket motor is manufactured by bonding together two types of propellants, an igniter and a sustainer. The shear strength of the bond is thought to be a linear function of the age of the propellant when the motor is cast. Shear strength and age of a random sample of motors was collected (a) The following figure shows the scatterplot of these data. Discuss if the simple linear regression model is appropriate for the relationship between these two variables based on the plot 10 15 20 25 Age (Weeks)

Explanation / Answer

(a)

The scatter plot shows that there is approximately linear relationship with negative slope between Age and Shear strength. The slope is negative because as the age increases, shear strength decreases. So, a simple linear regression model is appropriate for the relationshio between these two variables.

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