Identification of gender in human skeletons is an important part of many anthropological studies. An experiment conducted to determine whether measurements of the sacrum could be used to determine gender was described in the article “Univariate and Multivariate Methods for Sexing the Sacrum” (American Journal of Physical Anthropology [1978]: 103–110). Sacra from skeletons of individuals of known race (Factor A, with two levels—Caucasian and black) and gender (Factor B, with two levels—male and female) were measured and the lengths recorded. Data compatible with summary quantities given in the article were used to compute the following: SSA =857, SSB= 291, SSAB = 32, SSE= 5541, and error df 36.
a. Use a significance level of .01 to test the null hypothesis of no interaction between race and gender.
b. Using a .01 significance level, test to determine whether the mean length differs for the two races.
c. Using a .01 significance level, test to determine whether the mean length differs for males and females.
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