The values in the list below are measured maximum breadths of male Egyptian skulls from different epochs (in mm, based on data from Ancient Races of the Thebaid, by Thomson and Randall-Maciver). Changes in head shape over time suggest that interbreeding occurred with immigrant populations. Use a 0.05 significance level to test the claim that the mean is the same for the different epochs.
4000 bce 
1850 bce 
150 ce 
131 
129 
128 
138 
134 
138 
125 
136 
136 
129 
137 
139 
132 
137 
141 
135 
129 
142 
132 
136 
137 
134 
138 
145 
138 
134 
137