- Use table 6.4 on page 98 of your text to estimate the reliability for a single week from the alpha coefficient determined above.
- the given alpha coefficient is .885
- Use the estimated value obtained for a single week (from step 1) and substitute into the Spearman-Brown prophecy formula (or use table 6.4). How does the prophesized value compare to that obtained with the alpha coefficient?
-
I 5.00 : 12 RO 8C 4.00 31 ,35 39 39 43 47 50 53 56 .58 61 EE 36 41 45 49 52 56 59 61 64 66 63 99 co 70 19 74 SA ZS 18 19 g/ 65 .67 .69 .71 73 74 76 77 17 19 80 81 82 84 77 81 09 SZ 83 899 Table 6.4 Values of ra from Spearman-Brown Prophecy Formula k (CHANGE IN TEST LENGTH) 11 25 33 50 1.50 2.00 3.00 10 03 .04 05 14 18 25 03 04 06 17 21 29 .14 04 .05 20 20 25 33 16 05 06 09 09 22 22 36 10 .05 25 07 10 31 3 40 11 08 27 43 07 09 30 12 36 46 09 14 32 08 10 15 15 35 51 09 11 16 37 44 54 30 10 12 18 39 46 5b 11 13 19 41 48 59 34 11 15 20 44 51 36 12 30 22 53 45 63 38 13 17 23 48 55 65 10 14 40 18 25 57 150 67 12 42 19 15 2 27 59 44 16 21 54 10 46 18 22 30 56 63 48 19 23 32 58 65 73 50 20 25 33 52 21 26 35 62 76 54 23 -28 37 64 .70 78 .56 24 30 39 79 72 58 26 31 41 67 73 81 .60 27 33 43 59 75 62 29 35 45 71 83 // 64 31 37 47 73 78 84 33 66 .39 49 80 .74 .85 68 41 35 86 52 76 .70 37 44 .54 78 88 72 46 84 39 56 79 89 74 48 59 42 85 90 81 76 151 44 86 .61 83 78 54 47 64 88 84 91 .80 50 57 89 67 86 93 82 .87 60 .53 .69 91 .94 .84 72 .63 5/ 86 95 90 .75 92 .67 61 65 .71 88 94 92 .79 69 .75 82 193 95 .96 97 92 .74 79 95 .85 .98 .97 .84 .89 94 92 .89 86 99 .98 97 84 58 99 86 .85 87 28 98 88 87 89 90 88 89 16 1 89 18 9Z 78 .90 .91 93 92 93 94 06 93 .95 95 95 94 Z6 96 06 95 95 96 68 96 97 16 96 96 98 .97 6 98 06 86 99 86 96 99 08 99 96 98 4.00 31 35 39 43 47 SO 53 55 58 51 52 54 74 74 7 78 34 35 Table 6.4 Values of r. from Spearman-Brown Prophecy Formula K(CHANGE IN TEST LENGTH .25 33 50 1.50 2.00 2.00 .10 03 .04 05 12 D- 04 06 21 .14 04 05 20 25 16 05 09 22 28 35 -18 05 07 10 25 31 40 20 106 11 33 22 09 12 30 36 24 | 09 14 39 26 10 15 35 41 28 09 .11 16 37 54 30 .10 .12 18 39 46 32 11 13 -19 34 .11 15 20 44 51 36 12 16 22 46 38 13 .17 23 4B 55 40 14 18 25 50 42 15 ..19 27 52 44 16 21 54 61 46 18 22 30 56 .72 48 19 23 - 65 73 50 20 25 33 60 67 75 52 21 26 35 68 54 23 28 37 64 20 56 24 30 39 56 79 58 26 31 41 67 73 81 60 27 33 43 69 62 29 35 45 64 31 37 47 73 78 33 .66 39 BO 49 .85 .68 35 86 52 41 76 81 .70 37 54 78 82 72 39 46 56 -79 84 89 74 42 48 59 90 ST 85 76 44 51 .61 47 54 84 64 50 80 57 67 86 89 82 53 93 69 60 90 87 84 .63 57 91 .72 89 86 92 61 67 75 90 92 96 79 94 88 71 65 96 95 93 90 69 75 82 97 .74 92 95 85 79 98 .80 96 84 94 97 89 .86 96 .89 92 97 BBBBms%B8% mm www www www$wwm=ap BBB p% mmm 06 wwmg gompub Em Bmmmmmmmmm %%gotpsE9%mw% mun8 H x 8m & M %mmw%%%%% 9 KBS , s="smas%mg8mwennem a ww88888www88% www7% $nasage"% wax888mm 8mf88% 8 98 77 29 80 81 82 84 85 86 87 wmcm 8mwwwmmmmm88wmw8 %m%r % % %n%Eun armmmmmin %%% 89 89 89 92 95 93 94 95 95 96 97 97 98 98 98 8 99 I 5.00 : 12 RO 8C 4.00 31 ,35 39 39 43 47 50 53 56 .58 61 EE 36 41 45 49 52 56 59 61 64 66 63 99 co 70 19 74 SA ZS 18 19 g/ 65 .67 .69 .71 73 74 76 77 17 19 80 81 82 84 77 81 09 SZ 83 899 Table 6.4 Values of ra from Spearman-Brown Prophecy Formula k (CHANGE IN TEST LENGTH) 11 25 33 50 1.50 2.00 3.00 10 03 .04 05 14 18 25 03 04 06 17 21 29 .14 04 .05 20 20 25 33 16 05 06 09 09 22 22 36 10 .05 25 07 10 31 3 40 11 08 27 43 07 09 30 12 36 46 09 14 32 08 10 15 15 35 51 09 11 16 37 44 54 30 10 12 18 39 46 5b 11 13 19 41 48 59 34 11 15 20 44 51 36 12 30 22 53 45 63 38 13 17 23 48 55 65 10 14 40 18 25 57 150 67 12 42 19 15 2 27 59 44 16 21 54 10 46 18 22 30 56 63 48 19 23 32 58 65 73 50 20 25 33 52 21 26 35 62 76 54 23 -28 37 64 .70 78 .56 24 30 39 79 72 58 26 31 41 67 73 81 .60 27 33 43 59 75 62 29 35 45 71 83 // 64 31 37 47 73 78 84 33 66 .39 49 80 .74 .85 68 41 35 86 52 76 .70 37 44 .54 78 88 72 46 84 39 56 79 89 74 48 59 42 85 90 81 76 151 44 86 .61 83 78 54 47 64 88 84 91 .80 50 57 89 67 86 93 82 .87 60 .53 .69 91 .94 .84 72 .63 5/ 86 95 90 .75 92 .67 61 65 .71 88 94 92 .79 69 .75 82 193 95 .96 97 92 .74 79 95 .85 .98 .97 .84 .89 94 92 .89 86 99 .98 97 84 58 99 86 .85 87 28 98 88 87 89 90 88 89 16 1 89 18 9Z 78 .90 .91 93 92 93 94 06 93 .95 95 95 94 Z6 96 06 95 95 96 68 96 97 16 96 96 98 .97 6 98 06 86 99 86 96 99 08 99 96 98 4.00 31 35 39 43 47 SO 53 55 58 51 52 54 74 74 7 78 34 35 Table 6.4 Values of r. from Spearman-Brown Prophecy Formula K(CHANGE IN TEST LENGTH .25 33 50 1.50 2.00 2.00 .10 03 .04 05 12 D- 04 06 21 .14 04 05 20 25 16 05 09 22 28 35 -18 05 07 10 25 31 40 20 106 11 33 22 09 12 30 36 24 | 09 14 39 26 10 15 35 41 28 09 .11 16 37 54 30 .10 .12 18 39 46 32 11 13 -19 34 .11 15 20 44 51 36 12 16 22 46 38 13 .17 23 4B 55 40 14 18 25 50 42 15 ..19 27 52 44 16 21 54 61 46 18 22 30 56 .72 48 19 23 - 65 73 50 20 25 33 60 67 75 52 21 26 35 68 54 23 28 37 64 20 56 24 30 39 56 79 58 26 31 41 67 73 81 60 27 33 43 69 62 29 35 45 64 31 37 47 73 78 33 .66 39 BO 49 .85 .68 35 86 52 41 76 81 .70 37 54 78 82 72 39 46 56 -79 84 89 74 42 48 59 90 ST 85 76 44 51 .61 47 54 84 64 50 80 57 67 86 89 82 53 93 69 60 90 87 84 .63 57 91 .72 89 86 92 61 67 75 90 92 96 79 94 88 71 65 96 95 93 90 69 75 82 97 .74 92 95 85 79 98 .80 96 84 94 97 89 .86 96 .89 92 97 BBBBms%B8% mm www www www$wwm=ap BBB p% mmm 06 wwmg gompub Em Bmmmmmmmmm %%gotpsE9%mw% mun8 H x 8m & M %mmw%%%%% 9 KBS , s="smas%mg8mwennem a ww88888www88% www7% $nasage"% wax888mm 8mf88% 8 98 77 29 80 81 82 84 85 86 87 wmcm 8mwwwmmmmm88wmw8 %m%r % % %n%Eun armmmmmin %%% 89 89 89 92 95 93 94 95 95 96 97 97 98 98 98 8 99
