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Forecasting: Graphing Trends

1) Plot the following time series to determine which of the trend models appears to fit better.
Period
1 2 3 4 5 6 7 8 9 10
Time Series
55 57 53 49 47 39 41 33 28 20

2) The following trend line and seasonal indexes were computed from 4 weeks of daily observations. Forecast the 7 values for next week.
y=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

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