105 Cheek teeth of extinct primates. The American Journal of Physical Anthropology (Vol. 142, 2010) conducted a study of the characteristics of cheek teeth (e.g., molars)

in an extinct primate species . Recall that the researchers recorded the dentary depth of molars (in millimeters) for a sample of 18 cheek teeth extracted from skulls. The data are repeated in the table and saved in the CHEEKTEETH file. Estimate the true standard deviation in molar depths for the population of cheek teeth in extinct primates using a 95% confidence interval. Give a practical interpretation of the result. Are the conditions required for a valid confidence interval reasonably satisfied?

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18.12 16.55 19.48 15.70 19.36 17.83 15.94 13.25 15.83 16.12 19.70 18.13 15.76 14.02 17.00 14.04 13.96 16.20 Based on Boyer, D. M., Evans, A. R., and Jernvall, J. "Evidence of dietary differentiation among Late Paleocene-Early Eocene Plesiadapids (Mammalia, Primates)." American Journal of Physical Anthro- pology, Vol. 142, 2010 (Table A3).