The following trend line and seasonal indexes were computed from 4 weeks of daily observations. Forecast the 7 values for next week.
ŷ = 120 + 2.3t       t = 1, 2, . . . , 28

Day............................................................... Seasonal Index
Sunday................................................................. 1.5
Monday.................................................................. .4
Tuesday.................................................................. .5
Wednesday............................................................ .6
Thursday................................................................ .7
Friday.................................................................... 1.4
Saturday............................................................... 1.9