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9.65 Bolts Random samples of 200 bolts manufac- tured by a type A machine and 200 bolts

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9.65 Bolts Random samples of 200 bolts manufac- tured by a type A machine and 200 bolts manufactured by a type B machine showed 16 and 8 defective bolts, respectively. Do these data present sufficient evidence to suggest a difference in the performance of the machine types? Use a = 0.05.

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