Create a time series plot. b) Develop a six period moving average. What is the forecast for month 30? c) Develop an exponential smoothing forecast with a smoothing constant of 0.65. What is the forecast for month 30?

Purchasing and Supply Chain Management
6th Edition
ISBN:9781285869681
Author:Robert M. Monczka, Robert B. Handfield, Larry C. Giunipero, James L. Patterson
Publisher:Robert M. Monczka, Robert B. Handfield, Larry C. Giunipero, James L. Patterson
ChapterC: Cases
Section: Chapter Questions
Problem 5.1SC: Scenario 3 Ben Gibson, the purchasing manager at Coastal Products, was reviewing purchasing...
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#3) Calls to a college emergency hotline for the past 29 months are as follows:

Month

Calls

Month

Calls

1

45

16

50

2

30

17

50

3

20

18

35

4

35

19

30

5

40

20

55

6

30

21

70

7

15

22

45

8

25

23

35

9

30

24

37

10

15

25

46

11

10

26

17

12

35

27

33

13

50

28

40

14

30

29

60

15

20

 

 

a) Create a time series plot.

b) Develop a six period moving average. What is the forecast for month 30?

c) Develop an exponential smoothing forecast with a smoothing constant of 0.65. What is the forecast for month 30?

d) Calculate the MAD, MSE, and MAPE for each model in problems b, and c. Which model is the better predictor?

e) Actual calls during month 30 were 55. Which model is the better predictors? Explain.

f) Excel file

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