1. Assume you are employed by a consumer-products rating service and your assignments is to assess car batteries. For this part of your investigation. you
1. Assume you are employed by a consumer-products rating service and your assignments is to assess car batteries. For this part of your investigation. you want to determine whether there is a difference in useful life among the topof- the-line car batteries produces by three manufacturers (A, B and C). To provide the database for your assessment, you randomly sample four batteries from each manufacturer and run them through laboratory tests that allow you to determine the useful life of each battery. The following are the results given in months of useful battery life: BATTERY MANUFACTURER A B C 56 46 44 57 52 53 55 51 50 59 50 51 2. The accompanying table is a one-way independent groups ANOVA summary table with part of the material missing. Source of Variaton Sum of Squares Between groups 1253.68 Within groups Total 5016.4
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