The compressive strength of concrete is being studied, and four different mixing techniques are being investigated. The following data have been collected.

(a) Test the hypothesis that mixing techniques affect the strength of the concrete. Use a = 0.05.
(b) Find the P-value for the F-statistic computed in part (a).
(c) Analyze the residuals from this experiment.

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