3. In testing the strength of chains under heat treatments A and B, the following two sets of strengths were found. A :
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3. In testing the strength of chains under heat treatments A and B, the following two sets of strengths were found. A :
3. In testing the strength of chains under heat treatments A and B, the following two sets of strengths were found. A : 3610, 3608 , 3672, 3590 B: 3416, 3460, 3390, a) Find a 90 % confidence interval for 일 State your assumption(s) for your answer to be valid. b) On the basis of the confidence interval in part (a), do you think it is likely that o=0 ? Why? =
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