Question: 13 Using the equation for the trend line we predict that the seasonalised quarterly sales in summer, 2008 would be closest to: A 1180 B

13 Using the equation for the trend line we predict that the seasonalised quarterly sales in summer, 2008 would be closest to: A 1180 B 1382 C 1315 D 2055 E 2160 Extended-response questions 1 Graphically smooth the time series plot below using five-median smoothing 22000 21000- 20000 19000 18000- 17000 16000- 10 12 time 2 Joe's monthly earnings (in $000s) for 2015 are as shown in the table below. His earnings vary significantly throughout the year due to seasonal effects. Month Jan Feb Mar April May June July Aug Sept Oct Nov Dec Income 2.5 1.3 2.6 3.0 1.2 1.6 0.1 4.2 3.1 1.6 1.8 2.0 $000's a Determine the three-point moving mean for March using February, March and April. b Use this data to calculate a seasonal index for January, correct to 1 decimal place. c The seasonal index for September is 1.5 Determine his deseasonalised salary if he earns $3 567 in September 2016

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