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To study the effect of alloying on the resistance of electric wires, an engineer plans to measure the resistance of n1 = 35 standard wires and n2 = 45 alloyed wires. If it can be assumed that σ1 = 0.004 ohm and σ2 = 0.005 ohm for such data, what can she assert with 98% confidence about the maximum error if she uses 1 - 2 as an estimate of μ1 - μ2?

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