Question: Students in an engineering course performed an experiment to test the strength of four brands of garbage bags. One-kilogram weights were placed into a bag,

Students in an engineering course performed an experiment to test the strength of four brands of garbage bags. One-kilogram weights were placed into a bag, one at a time, until the bag broke. A total of 40 bags were used (10 for each brand). The data file < TRASH_BAGS > gives the weight (in kilograms)

required to break the bags.

At the 0.05 level of significance, is there evidence of a significant difference in the median strength of the four brands of garbage bags?

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