Refer to the American Journal of Physical Anthropology (Vol. 142, 2010) study of the characteristics of cheek teeth (e.g., molars) in an extinct primate species, Exercise 2.14. Recall that the researchers recorded the dentary depth of molars (in millimeters) for a sample of 18 cheek teeth extracted from skulls. These depth measurements are reproduced in the accompanying table. Anthropologists know that the mean dentary depth of molars in an extinct primate species— called Species “A”—is 15 millimeters. Is there evidence to indicate that the sample of 18 cheek teeth come from some other extinct primate species (i.e., some species other than Species “A”)? Use the accompanying SPSS printout to answer the question.

Data from Exercise 2.14

The characteristics of cheek teeth (e.g., molars) can provide anthropologists with information on the dietary habits of extinct mammals. The cheek teeth of an extinct primate species was the subject of research reported in the American Journal of Physical Anthropology (Vol. 142, 2010). A total of 18 cheek teeth extracted from skulls discovered in western Wyoming were analyzed. Each tooth was classified according to degree of wear (unworn, slight, light-moderate, moderate, moderate-heavy, or heavy). In addition, the researchers recorded the dentary depth of molars (in millimeters) for each tooth.

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One-Sample Statistics Std. Error Mean N Мean Std. Deviation M2Depth 18 16.4994 1.97042 .46443 One-Sample Test TestValue= 15 95% Confidence Interval of the Difference Sig. (2-tailed) Mean Difference t df Lower Upper M2Depth 3.229 17 .005 1.49944 .5196 2.4793