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 a = .05.

(c) What is your conclusion about the slope?

(d) Interpret the 95 percent confidence limits for the slope.

(e) Verify that F = r2 for the slope.

(f) In your own words, describe the fit of this regression.

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