Montgomery (2001) presented the results of an experiment to compare four different mixing techniques on the tensile strength of port land cement. The results are shown in the following table. Is there any indication that mixing technique affects the strength? Use a =0.05.

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Mixing Tensile Strength (Ib/in.) 2865 2975 2985 2600 Technique 3129 2890 3150 3050 3000 2 3000 2900 3200 2800 2600 4 2700 2765