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Consider a regression situation in which y = hardness of molded plastic and x = amount of time elapsed since termination of the molding process. Summary quantities included the following.
n = 16, SSResid = 1238.49, and SSTo = 25,317.365.
(a) find out a point estimate of σ. (Give the answer to three decimal places.)

(b) What proportion of observed variation in hardness can be describeed by the simple linear regression model relationship between hardness and elapsed time? (Give the answer to three decimal places.)

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