Do you think the? least-squares regression line is a good? model? why? a.? no, because the residuals form a pattern. b.? yes, because the residuals form a pattern. c.? yes, because the residuals do not form a pattern. d.? no, because the residuals do not form a pattern. e.? yes, because the scatterplot appears to be a straight line.

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)