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John has collected the following information on the amount of tips he has collected from parking cars the last seven nights. Day Tips 1 18

John has collected the following information on the amount of tips he has collected from parking cars the last seven nights.

Day Tips

1 18

2 22

3 17

4 18

5 28

6 20

7 12

a. Compute the 3-day moving averages for the time series.

b. Compute the mean square error for the forecasts.

c. Forecast John's tips for day 7.

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