In an experiment to investigate the performance of four different brands of spar

Question

In an experiment to investigate the performance of four different brands of spark plugs, five plugs of each brand were tested and the number of miles (at a constant speed) until failure was observed. The partial ANOVA table for the data is given below. a) Fill in the missing entries in the above table. b) State the relevant hypotheses, and carry out the test at the 5% significance level. If they do not know how to calculate the pvalue, they would answer this question. I would suggest to give them the p-value

Explanation / Answer

a)

b) null hypothesis: all treatments have equal mean(effect) value

alternate hypothesis:at least two of means have diffierent mean values

as p value is less then 0.05 level we fail to reject null hypothesis and conclude that all means are equal

Source DF SS MS F P value treatment 3 75000 25000 1.70068 0.2070 Error 16 235200 14700 Total 19 310200

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