Essay
Lifetime of Brake Shoes Narrative
An automobile parts store was interested in comparing the mean life length of three brands of automobile brake shoes. The following data represent the life length, measured in 1000s of kilometres, of random samples of six sets of brake shoes of each brand: 
-Refer to Lifetime of Brake Shoes Narrative. State the null and alternative hypotheses to test whether there is a significant difference in mean life length among the three brands of brake shoes. Let 
= 0.05.
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