. Spelling ability, its measurement and distribution. 99 3.1 6903 56 5.1 7240 I 1.2 2388 95 3753 288 3.2 6959 38 5.2 7241 .6 1.3 2483 79 4041 276 3.3 6997 38 5.3 7241.6 .6 1.4 2562 60 4317 260 3.4 7035 37 5.4 7242.2 .6 1.5 2622 50 4577 242 3.5 7072 37 5.5 7242.8 .6 1.6 2672 35 4819 235 3.6 7109 19 5.6 7243.4 .4 1.7 2707 27 5054 215 3.7 7128 19 5.7 7243.8 .4 1.8 2734 14 5269 197 3.8 7147 19 5.8 7244.2 .4 1.9 2748 6 5466 184 3.9 7166 19 5.9 7244.6 .4 2.0 2754 5650 4.0 7185 6.0 7245 In this manner each of the Modified Tables of Frequency wasmade up. They are given in tables XXXVI to XLI. Theyare

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. Spelling ability, its measurement and distribution. 99 3.1 6903 56 5.1 7240 I 1.2 2388 95 3753 288 3.2 6959 38 5.2 7241 .6 1.3 2483 79 4041 276 3.3 6997 38 5.3 7241.6 .6 1.4 2562 60 4317 260 3.4 7035 37 5.4 7242.2 .6 1.5 2622 50 4577 242 3.5 7072 37 5.5 7242.8 .6 1.6 2672 35 4819 235 3.6 7109 19 5.6 7243.4 .4 1.7 2707 27 5054 215 3.7 7128 19 5.7 7243.8 .4 1.8 2734 14 5269 197 3.8 7147 19 5.8 7244.2 .4 1.9 2748 6 5466 184 3.9 7166 19 5.9 7244.6 .4 2.0 2754 5650 4.0 7185 6.0 7245 In this manner each of the Modified Tables of Frequency wasmade up. They are given in tables XXXVI to XLI. Theyare intended to take the place, each for the grade to which itapplies, of the Table of Frequency for the normal distribution.Since they are asymmetrical, the lower and upper parts have tobe given separately. For the same reason there is no P.E., theuse of the Probable Error as a unit of amount being properlyconfined to normal curves only (Yule, ii, p. 147). Thequartile deviation (Q3 — Qi) might be used instead, but its Derived Forms of Distribution 99.