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1. (Continuation of the Portland cement data) The tensile strength of Portland cement is being studied. Four different mixing techniques can be used economically. A completely randomized experiment was conducted and the following data were collected. Mixing Technique Tensile Strength (lb/in) 3129 200 3300 2975 2800 2900 2985 2600 2700 2600 3000 2865 2890 3150 3050 2765 (a) Calculate the standardized residuals of the ANOVA model and calculate the theoretical normal quantiles. Make a table of theoretical normal quantiles vs observed quantiles of the residuals.
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