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A sample of 16 joint specimens of a particular type gave a sample mean proportional limit...

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Statistics

A sample of 16 joint specimens of a particular type gave asample mean proportional limit stress of 8.44 MPa and a samplestandard deviation of 0.73 MPa.

(a) Calculate and interpret a 95% lower confidence bound for thetrue average proportional limit stress of all such joints. (Roundyour answer to two decimal places.)

(b) Calculate and interpret a 95% lower prediction bound forproportional limit stress of a single joint of this type. (Roundyour answer to two decimal places.)

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