. The Bell System technical journal . 13 88 10 11 10 .09 0 89 6 8 7 .50 .14 90 10 6 5 91 2 4 3 .ii 92 3 2 2 .50 .50 93 2 1 1 94 1 1 1 0 0 95 0 0 1 V 675 675 676 Probability of fit P .957 .694 = *= .521 = ;ri= .178ro.\iniation isalso a very close fit to the obser\ed frequencies, the ])r<jbability of fitbeing in this case .69. As a result of these calculations shall we con-clude that the distribution is composed of two normal components asindicated in Fig. 10, or shall we conclude that the distribution is
. The Bell System technical journal . 13 88 10 11 10 .09 0 89 6 8 7 .50 .14 90 10 6 5 91 2 4 3 .ii 92 3 2 2 .50 .50 93 2 1 1 94 1 1 1 0 0 95 0 0 1 V 675 675 676 Probability of fit P .957 .694 = *= .521 = ;ri= .178ro.\iniation isalso a very close fit to the obser\ed frequencies, the ])r<jbability of fitbeing in this case .69. As a result of these calculations shall we con-clude that the distribution is composed of two normal components asindicated in Fig. 10, or shall we conclude that the distribution is homo-geneous? In other words, do the skulls belong to two or to only. Fii;. 10 one race? Tlie measure giwn 1)\ the probaliilily of fu is, of course,in favor of the first alternative. It is hii^hly ])rol)al)le, howe\-er, thatif we had been given the obser\ed distributioTi without any discussionof what it meant we would ha\e decided that it probabh- was con-sistent with the assumption of the random s\-stem of causes such asmight underlie the second approximation. In other worils, if we had been gi\en nuTely the above set ol skullmeasurements, it is reasonable to suppose we might have concludedthat the distribution was homogeneous. However, when our judgmentis colored l)y the facts which cannot be presented in the arraN- ofobserved frequencies we must conclude that it is highly probablethat the obserxid lia\e arisen from a non-homogcncoiis i)op-ulation. Statistical methods alone do not answer all of llic (|urstioiis thataie raised in this problem nor do the> answer ilieni in nuun is almost always room for judgment to enter. Thus, anal
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
