Question

*******NOTE: I must be able to attach an **EXCEL** document with cell data to the assignment...

*******NOTE: I must be able to attach an **EXCEL** document with cell data to the assignment submission. More important than the answer is the step by step process on how to get these functions to work properly in **EXCEL**. Thank you!******

Using the given data set, please forecast future sales data using each method. Then, determine which method you prefer and why.

GAP Data set:

$M
Year Quarter Period GAP
2012 Q1 1 $ 3,487
2012 Q2 2 $ 3,575
2012 Q3 3 $ 3,864
2012 Q4 4 $ 4,725
2013 Q1 5 $ 3,729
2013 Q2 6 $ 3,868
2013 Q3 7 $ 3,976
2013 Q4 8 $ 4,575
2014 Q1 9 $ 3,774
2014 Q2 10 $ 3,981
2014 Q3 11 $ 3,972
2014 Q4 12 $4,708


Forecasting Method Q1 Q2 Q3 Q4
4 point moving average - - -
Simple Exponential Smoothing (0.1) - - -
Simple Linear Regression (Trend)
Trend and Seasonal
Forecasting Errors MAD RSQ
4 pt MA -
Exp Sm -
Trend (Linear Regression)
Trend and Seasonal
Q1 Q2 Q3 Q4
Scaled Seasonal Index
Optimal alpha (exp smoothing)

a: Fill in the blank Units: $Millions

Where appropriate provide answers as accurate as: 3 d.p.

B: Explain, based on your analysis, which method of forecasting should be used by the company and justify this using as many arguments as possible. You will earn points for a convincing answer.

c: Why do you think this company experiences its biggest sales push in the season you chose? What should the company do to make sales more evenly distributed throughout the year? Discuss the implication of the slope and intercept in your analysis.

Homework Answers

Answer #1
Year quarter period $M Gap 4 Figures Moving Total 4 Figures Moving Average 2 Figures Moving Total 2 Figures Moving Average(T)
2012 1 1 3487
2 2 3575
15651 3912.75
3 3 3864 7886 3943
15893 3973.25
4 4 4725 8019.75 4009.875
16186 4046.5
2013 1 5 3729 8121 4060.5
16298 4074.5
2 6 3868 8111.5 4055.75
16148 4037
3 7 3976 8085.25 4042.625
16193 4048.25
4 8 4575 8124.75 4062.375
16306 4076.5
2014 1 9 3774 8152 4076
16302 4075.5
2 10 3981 8184.25 4092.125
16435 4108.75
3 11 3972
4 12 4708

We use 2 figure moving average then

Years/Quarters 1 2 3 4
2012 3943 4009.88
2013 4060.5 4055.75 4042.63 4062.38
2014 4076 4092.13
Total 8136.5 8147.88 7985.63 8072.26
Seasonal Average 4068.25 4073.94 3992.815 4036.13
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