Question: Tool life (or how long it takes for a tool to wear out) is important in manufacturing. An engineer did a study to see how

Tool life (or how long it takes for a tool to wear out) is important in manufacturing. An engineer did a study to see how two factors, rotational speed and vertical pressure, affected the tool life of a drill. Tool life is in hours of operation, speed is in revolutions per minute, and pressure is in pounds of force.The data and analysis are shown below.

speed pressure tool life 330 10 55 Regression Statistics 630 10 40 Multiple R 0.919 330 20 51 R Square 0.845 630 20 35 Adjusted R Square 0.807 330 10 53 Standard Error 3.540 630 10 36 Observations 11 330 20 44 630 20 30 ANOVA 480 14 40 SS MS F Signf F 480 14 47 Regression 2 548.312 274.156 21.881 0.000571 480 14 38 Residual 8 100.234 12.5292 Total 10 648.545 Coeff Stand Err t Stat Pvalue Lower 95% Upper 9! Intercept 75.965 5.533 13.729 0.000 63.206 88.7 speed -0.052 0.008 -6.193 0.000 -0.071 -0.0 pressure -0.579 0.249 -2.326 0.048 -1.153 -0.0

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