Chapter 4 - Time Series Unit 3

Using four-mean smoothing with centering, the smoothed profit for May is closest to

• $2502

• $3294

• $3503

• $3804

• $4651

Using these sale figures, the seasonal index for quarter 3 is closest to

• 1.28

• 1.30

• 1.38

• 1.46

• 1.48

The time series is best described as having

• seasonality only

• irregular fluctuations only

• seasonality with irregular fluctuations

• a decreasing trend with irregular fluctuations

• an increasing trend with irregular fluctuations

The seven-median smoothed maximum wind speed, in kilometres per hour, for day 4 is closest to

• 22

• 26

• 27

• 30

• 32

The seasonal index for the sales of cold drinks in a shop in January is 1.6. To correct the January sales of cold drinks for seasonality, the actual sales should be

• reduced by 37.5%

• reduced by 40%

• reduced by 62.5%

• increased by 60%

• increased by 62.5%

The seasonal index for Wednesday is 0.84. This tells us that, on average, the number of meals served on a Wednesday is

• 16% less than daily average

• 84% less than the daily average

• the same as the daily average

• 16% than the daily average

• 84% more than the daily average

Last Tuesday, 108 meals were served in the restaurant. The deseasonalised number of meals served last Tuesday was closest to

• 93

• 100

• 110

• 131

• 152

The seasonal index for Saturday is closest to

• 1.22

• 1.31

• 1.38

• 1.45

• 1.49

The seasonal index for December is

• 0.89

• 0.97

• 1.02

• 1.23

• 1.29

In May the store sold $213956 worth of sporting equipment. The deseasonalised value for these sales was closest to

• $165 857

• $190 420

• $209 677

• $ 218 322

• $240 400