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Homework answers / question archive / Skull Breadths: Maximum breadths of samples of male Egyptian skulls from4000 B
Skull Breadths: Maximum breadths of samples of male Egyptian skulls from4000 B.C. and 150 A.D. (based on data from Ancient Races ofthe Thebaid by Thomsoon Randall-Maciver).
4000 B.C.: 131 119 138 125 129 126 131 132 126 128 128 131
150 A.D.: 136 130 126 126 139 141 137 138 133131 134 129
Changes in head sizes over time suggest interbreeding with peoplefrom other regions. Use confidence intervals to determine whetherthe head sizes appear to have changed from 4000 B.C. to 150 A.D.Explain your result.
Answer:
From the data we observethe difference between the two means
Two-sample T for C1 vs C2
N Mean StDev SE Mean
C1 12 128.67 4.64 1.3
C2 12 133.33 5.02 1.4
Difference = mu (C1) - mu (C2)
Estimate for difference: -4.66667
95% CI for difference: (-8.76772,-0.56561)
T-Test of difference = 0 (vs not =): T-Value= -2.37 P-Value = 0.028 DF = 21
