Archeologists have discovered a sample of ancient Egyptian skulls from two different time periods, 4000 B.C. and 150 A.D. They believe that the mean maximum skull breadth (the width of the skull at its widest part) has increased from 4000 B.C. to 150 A.D. A sample of 16 Eqyptian skull breadths (in mm) from each time period is show below: 4000 BC 128 131 120 129 124 138 137 135 131 137 119 133 137 137 137 134 150 AD 128 128 137 137 130 136 134 136 135 130 133 133 139 137 128 142 (a) Calculate the mean and standard deviation for each data set. Round each mean to 2 decimal places, and each standard deviation to 4 decimal places. 4000 BC mean: 150 AD mean: 4000 BC standard deviation: 150 AD standard deviation:
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Archeologists have discovered a sample of ancient Egyptian skulls from two different time periods, 4000 B.C. and 150 A.D. They believe that the
4000 BC
| 128 | 131 | 120 | 129 | 124 | 138 | 137 | 135 | 131 | 137 | 119 | 133 | 137 | 137 | 137 | 134 |
150 AD
| 128 | 128 | 137 | 137 | 130 | 136 | 134 | 136 | 135 | 130 | 133 | 133 | 139 | 137 | 128 | 142 |
(a) Calculate the mean and standard deviation for each data set. Round each mean to 2 decimal places, and each standard deviation to 4 decimal places.
4000 BC mean:
150 AD mean:
4000 BC standard deviation:
150 AD standard deviation:
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