The following gives the number of pints of type B blood used at Woodlawn Hospita

Question

The following gives the number of pints of type B blood used at Woodlawn Hospital in the past 6 weeks: Forecast the demand for the week of October 12 using a 4 week moving average. Use a 4 week weighted moving average, with weights of .1, .2, and.4, using .4 for the most recent week. Forecast demand for the week of October 12. Compute the forecast for the week of October 12 using exponential smoothing with a forecast for August 31 of 360 and alpha = .3 Based on this data, one may find the linear trend projection to be F_t = 387.53 -.72*t. Compute the forecast for the week of October 12 using the learn trend approach.

Explanation / Answer

a) Four week moving average estimate :

410 + 381 + 368 + 374 / 4

= 383.25

b)

0.1(410) + 0.2(381) + 0.3(368) + 0.4(374) = 377.2

c)

Hope this helps.

Demand Forecast Aug-31 360 360 Sep-07 389 360 Sep-14 410 368.7 Sep-21 381 381.09 Sep-28 368 381.063 Oct-05 374 377.1441 Oct-12 376.2009

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