Brain Volume The average (mean) volume of the brains included in Data Set 6 of Appendix B
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Brain Volume The average (mean) volume of the brains included in Data Set 6 of Appendix B is 1126.0 cm3.
Determine whether the given value is a statistic or a parameter.
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Data Set 6: IQ and Brain Size The data are obtained from monozygotic (identical) twins. PAIR identifies the set of twins, SEX is the gender of the subject (1 = male, 2=female), ORDER is the birth order, IQ is full-scale IQ, VOL is total brain volume (cm), AREA is total brain surface area (cm), CCSA is corpus callosum (fissure connecting left and right cerebral hemispheres) surface area (cm), CIRC is head circumference (cm), and WT is body weight (kg). Data provided by M. J. Tramo, W. C. Loftus, T. A. Stukel, J. B. Weaver, M. S. Gazziniga. See "Brain Size, Head Size, and IQ in Monozygotic Twins," Neurology, Vol. 50. STATDISK: Minitab: Excel: Data set name is IQ and Brain Size. Worksheet name is IQBRAIN.MTW. Workbook name is IQBRAIN.XLS. TI-83/84 Plus: App name is IQBRAIN and the individual column names are the same as for text files. Text file names: PAIR, SEX, ORDER, IQ, VOL, AREA, CCSA, CIRC, WT PAIR SEX ORDER 10 VOL AREA CCSA CIRC WT 1 2 1 96 1005 1913.88 6.08 54.7 57.607 1 2 2 89 963 1684.89 5.73 54.2 58.968 2 2 1 87 1035 1902.36 6.22 53.0 64.184 2 2 2 87 1027 1860.24 5.80 52.9 58.514 3 2 1 101 1281 2264.25 7.99 57.8 63.958 3 2 2 103 1272 2216.40 8.42 56.9 61.690 4 2 1 103 1051 1866.99 7.44 56.6 133.358 4 2 2 96 1079 1850.64 6.84 55.3 107.503 5 2 1 127 1034 1743.04 6.48 53.1 62.143 5 2 2 126 1070 1709.30 6.43 54.8 83.009 6 1 2 101 1173 1689.60 7.99 57.2 61.236 6 1 1 96 1079 1806.31 8.76 57.2 61.236 7 1 2 93 1067 2136.37 6.32 57.2 83.916 7 1 1 88 1104 2018.92 6.32 57.2 79.380 8 1 2 94 1347 1966.81 7.60 55.8 97.524 88 1 1 85 1439 2154.67 7.62 57.2 99.792 9 1 1 97 1029 1767.56 6.03 57.2 81.648 9 1 2 114 1100 1827.92 6.59 56.5 88.452 10 1 2 113 1204 1773.83 7.52 59.2 79.380 10 1 1 124 1160 1971.63 7.67 58.5 72.576
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