Pottery Archaeologists can use the chemical composition of clay found in pottery artifacts to determine whether different sites were populated by the same ancient people. They collected five samples of Romano-British pottery from each of two sites in Great Britain–the Ashley Rails site and the New Forest site–and measured the percentage of aluminum oxide in each. Based on these data, do you think the same people used these two kiln sites? Base your conclusion on a 95% confidence interval for the difference in aluminum oxide content of pottery made at the sites. (A. Tubb, A. J. Parker, and G. Nickless, “The Analysis of Romano-British Pottery by Atomic Absorption Spectrophotometry,” Archaeometry, 22:153–171)

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Ashley Rails 19.1 14.8 16.7 18.3 17.7 New Forest 20.8 18.0 18.0 15.8 18.3