A rocket motor is manufactured by bonding together two types

A rocket motor is manufactured by bonding together two types

A rocket motor is manufactured by bonding together two types of propellants, an igniter and a sustainer. The shear strength of the bond y is thought to be a linear function of the age of the propellant x when the motor is cast. Twenty observations are shown in the table on the next page.
(a) Draw a scatter diagram of the data. Does the straight-line regression model seem to be plausible?

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