Question: Hamilton, Seavey, and Stucker measured resistances, diameters, and lengths for seven copper wires at two different temperatures and used these to compute experimental resistivities for copper at these two temperatures. Their data follow. The units are \(10^{-8} \Omega \mathrm{m}\).

1. Suppose that primary interest here centers on the difference between resistivities at the two different temperatures. Make a normal plot of the seven observed differences. Does it appear that a normal distribution description of the observed difference in resistivities at these two temperatures is plausible?
2. Give a \(90 \%\) two-sided confidence interval for the mean difference in resistivity measurements for copper wire of this type at \(21.8^{\circ} \mathrm{C}\) and \(0.0^{\circ} \mathrm{C}\).

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