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Spreading rate of spilled liquid. Refer to the Chemicial Engineering Progress (January 2005) study of the rate at which a spilled volatile liquid will spread across a surface. Recall that simple linear regression was used to model y = mass of the spill as a function of x = elapsed time of the spill

(a) Find a 90% confidence interval for the mean mass of all spills with an elapsed time of 15 minutes. Interpret the result

(b) Find a 90% prediction interval for the mass of a single spill with an elapsed time of 15 minutes. Interpret the result.

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