Question: B. Choi tested the stopping properties of various bike tires on various surfaces. For one thing, he tested both treaded and smooth tires on dry concrete. The lengths of skid marks produced in his study under these two conditions were as follows (in \(\mathrm{cm}\) ).

(b) Proceed under the necessary model assumptions to assess the strength of Choi's evidence of a difference in mean skid lengths.

(c) Make a 95% two-sided confidence interval for \(\mu_{\text {Treaded }}-\mu_{\text {Smooth }}\) assuming that treaded and Smooth skid marks have the same variability.

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