MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Observations of the demand for a certain part stocked at a parts supply depot during the calendar
year 2013 were:
| Month | Demand | Month | Demand |
| Jan | 89 | july | 223 |
| Feb | 57 | august | 286 |
| mar | 144 | sept | 212 |
| april | 221 | oct | 275 |
| may | 177 | nov | 188 |
| june | 280 | dec | 312 |
a) Using a four-month moving average, determine the one-step-ahead forecast for July
through December 2013.
b) Using a four-month moving average, determine the two-step-ahead forecast for July
through December 2013.
c) Obtain the MAD for the forecasts obtained in the above sections. Which method gave
better results? Based on forecasting theory, which method should have given better
results?
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- Given the following history, use a three-quarter moving average to forecast the demand for the third quarter of this year. Note that the 1st quarter is January, February, and March; 2nd quarter April, May, June: 3rd quarter July, August, September; and 4th quarter October, November, December. Note: Round final answer to a whole number. JANUARY FEBRUARY MARCH APRIL MAY JUNE JULY AUGUST SEPTEMBER OCTOBER NOVEMBER DECEMBER Last year 120 145 155 195 205 220 170 160 150 220 245 270 This year 145 155 175 210 215 210arrow_forwardCalculate Fisher's price index from the following data and check whether time Reverse Test is satisfied: Base year (1990) Current year (1995) Commodity Price Quantity Price Quantity A 32 50 30 50 B 30 35 25 40 C 16 55 18 50arrow_forward(b) Table 1 shows consumables usage data from a leading manufacturer. Forecast the demand for August, September and October using: i) a three-month moving average ii) a four-month weighted moving average using 50 percent of the actual usage for the most recent month, 20 percent of two months ago, 15 percent of three months ago and 15 percent of four months ago. Using an example, explain what are the benefits of using the weighted moving average method of forecasting instead? Month February 2023 March 2023 April 2023 May 2023 June 2023 July 2023 Consumables Used 884 892 972 990 956 880arrow_forward
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