3.8

Roger Ginde is developing a program in supply chain management certification for managers. Ginde has listed a number of activities that must be completed before a training program of this nature could be conducted. The activities, immediate predecessors, and times appear in the accompanying table:

ACTIVITY	IMMEDIATE PREDECESSOR(S)	TIME (DAYS)
A	-	2
B	-	5
C	-	1
D	B	10
E	A, D	3
F	C	6
G	E, F	8

a) Develop an AON network for this problem.

b) What is the critical path?

c) What is the total project completion time?

d) What is the slack time for each individual activity?

4.6

The monthly sales for Yazici Batteries, Inc., were as follows:

MONTH	SALES
January	20
February	21
March	15
April	14
May	13
June	16
July	17
August	18
September	20
October	20
November	21
December	23

a) Plot the monthly sales data.

b) Forecast January sales using each of the following:

i) Naive method.

ii) A 3-month moving average.

iii) A 6-month weighted average using .1, .1, .1, .2, .2, and .3, with the heaviest weights applied to the most recent months.

iv) Exponential smoothing using an a = .3 and a September forecast of 18.

v) A trend projection.

c) With the data given, which method would allow you to forecast next Marchs sales?