In an experiment to investigate the performance of four different brands of spark plugs intended for use

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In an experiment to investigate the performance of four different brands of spark plugs intended for use on a 125-cc motorcycle, five plugs of each brand were tested, and the number of miles (at a constant speed)

until failure was observed. A partially completed ANOVA table is given. Fill in the missing entries, and test the relevant hypotheses using a .05 level of significance.

Source of Variation df Sum of Squares Mean Square F Treatments Error 235,419.04 Total 310,500.76

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