The compressive strength of concrete is being studied, and four different mixing techniques are being investigated. The following data have been collected. Mixing Technique Compressive Strength (psi) Observations 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 affect the strength of concrete. Use α=0.05. Calculate to 2 decimal places f0:     Does mixing technique affect concrete strength?                                                               (b) Find to 2 decimal places the P-value for the F-statistic computed in part (a). P-value =  (c) Analyze the following residual plots to determine model adequacy. Does the assumption of normality seem reasonable?                                                               Does the assumption of constant variance seem reasonable?

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