Calculate the seasona! indices by the 'ratio to moving average' method from the fotnowing data. Year Quarter Y 4-Quarterly Moving Average 2005 75 II 60 54 63 375 IV 59 65 375 2005 86 67.125 65 70 875 63 74 000 IV 80 75 375 2007 90 76.625 72 77.625 66 79:500 85 81.500 2008 100 83-000 78 84 750 /II 72 IV 93 ミミニミミミ

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