13-3. The compressivestrength of concrete is being studied, and four different m

Question

13-3. The compressivestrength of concrete is being studied, and four different mixingtechniques are being investigated. The following data have beencollected.




Mixing Technique Compressive Strength (psi)
1 3129 3000 2865 2890 2 3200 3300 2975 3150 3 2800 2900 2985 3050 4 2600 2700 2600 2765




(a) Test the hypothesis that mixing techniques affectthe strength of the concrete. Use = 0.05.




(b) Find the P-value for the F-statistic computed inpart (a).




(c) Analyze the residuals from this experiment. 13-3. The compressivestrength of concrete is being studied, and four different mixingtechniques are being investigated. The following data have beencollected.




Mixing Technique Compressive Strength (psi)
1 3129 3000 2865 2890 2 3200 3300 2975 3150 3 2800 2900 2985 3050 4 2600 2700 2600 2765




(a) Test the hypothesis that mixing techniques affectthe strength of the concrete. Use = 0.05.




(b) Find the P-value for the F-statistic computed inpart (a).




(c) Analyze the residuals from this experiment.

Explanation / Answer

One-way ANOVA: Compressivestrength versus Technique

Source     DF     SS       MS        F        P
Technique   3 489740 163247 12.73  0.000
Error      12 153908   12826
Total      15 643648

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