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Two kinds of thread are being compared for strength. Fifty pieces of each type of thread...

Two kinds of thread are being compared for strength. Fifty pieces of each type of thread are tested under similar conditions. Brand A has an average tensile strength of 78.3 kilograms with a standard deviation of 5.6 kilograms, while brand B has an average tensile strength of 87.2 kilograms with a standard deviation of 6.3 kilograms. (a) We set significance at 4%, can we claim that there is difference the tensile strengths of the two brand? (justify your answer using a hypothesis test)

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