Assume that the compressive strength (lb/in.2) of Boston blue clay has a true variance of 15.5 (lb/

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Assume that the compressive strength (lb/in.2) of Boston blue clay has a true variance of 15.5 (lb/

in.2)2. Can we conclude that the sample of values in Problem 9.61 has a mean that is significantly less than 50 lb/in.2?

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