The Compressive Strength Of Concrete Is Being Studied And Four Different Mixing Techniques Are Being Investigated The 1 (44.94 KiB) Viewed 29 times
The compressive strength of concrete is being studied, and four different mixing techniques are being investigated. The following data have been collected. Compressive Strength (psi) Mixing Technique 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 a = 0.05. Calculate to 2 decimal places fo: i 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 = i (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?
Residuals Versus TECHNIQU (response is STRENGTH 200 100 прв -100 TECHNIQU Residuals Versus the Fitted Values response is STRENGTH) 200 100 Residad . -100 200 2650 2750 2850 2950 3050 3150 Fitted Value
Normal Probability Plot of the Residuals (response is STRENGTH) N 2 Normal Score 200 -100 100 200 Residual
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