In the following regression, X = monthly maintenance spending (dollars), Y = monthly machine downtime (hours), and n = 15 copy machines.
(a) Write the fitted regression equation.
(b) State the degrees of freedom for a two-tailed test for zero slope, and use Appendix D to find the critical value at α = .05.
(c) What is your conclusion about the slope?
(d) Interpret the 95 percent confidence limits for the slope.
(e) Verify that F = t2 for the slope.
(f) In your own words, describe the t of this regression.

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R2 Std. Error 286.793 0.370 ANOVA table Source df MS F p-value 628,298.2 1,069,251.8 1,697,550.0 628,298.2 7.64 82,250.1 0161 Residual 13 Total 14 Regression output variables coefficients std. error Intercept 1,74357 288.82 confidence interval t(df-13) p-value 95% lower 95% upper 6.037 0000 2,367,53 1-0.2656 Slope -1.2163 0.4401-2.764 016 2.1671