A rental car manager estimates the number of full-size sedans rented per week 5 so that she can maintain adequate number of cars in the lot. Data for the past 10 weeks are shown here: SCLM 456

Week Rentals Week Rentals

1 23 6 28

2 24 7 32

332 8 35

4 269 26

5 311024

a) Prepare a forecast through week 11 by using a five -week moving average

b) Prepare a forecast through week 11 by using a 3-period weighted moving average, giving the weight of 0.5 to the most recent week, 0.3 to the second week and 0.2 to the third week.

c) Prepare a forecast using exponential smoothing method with α = 0.2. Forecast for week 1 was 22.

d) Prepare a forecast through week 11 by using a regression model Y= 26.33 + 0.3212X

d) Which method is preferred for this data if mean absolute deviation (MAD) is used?

e) Make a recommendation for number of full-size sedans for a week.