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A random sample is selected from each of 3 makes of safety belts and their breaking strength(in certain units) are measured with the following results:

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A random sample is selected from each of 3 makes of safety belts and their breaking strength(in certain units) are measured with the following results: I 70 72 75 80 83 II 60 65 57 84 87 73 III 100 110 108 112 113 120 107 Using CRD, test whether the breaking strength of the safety belts differ significantly

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