12 General Unit 3 Topic 2 2020

The pattern in the time series in the graph shown is best described as:

• trend

• cyclical but not seasonal

• seasonal

• irregular

• average

The three-moving mean for time period 2 is closest to:

• 3.4

• 3.6

• 3.9

• 4.0

• 4.2

The five-moving mean for time period 3 is closest to:

• 3.4

• 3.6

• 3.9

• 4.1

• 4.2

The two-moving mean for time period 5 with centring is closest to:

• 2.7

• 3.6

• 3.9

• 4.0

• 4.2

The four-moving mean for time period 4 with centring is closest to:

• 2.7

• 3.6

• 3.9

• 4.1

• 4.2

The seasonal indices for the number of customers at a restaurant are as follows.

The value of p is:

• 0.5

• 0.7

• 0.8

• 1.0

• 1.2

The seasonal indices for the number of bathing suits sold at a surf shop are given in the table.

The number of bathing suits sold one summer is 432. The deseasonalised number is closest to:

• 432

• 240

• 778

• 540

• 346

The seasonal indices for the number of bathing suits sold at a surf shop are given in the table.

The deseasonalised number of bathing suits sold one winter was 380. The actual number was closest to:

• 114

• 133

• 152

• 380

• 1267

The seasonal indices for the number of bathing suits sold at a surf shop are given in the table.

The seasonal index for spring tells us that, over time, the number of bathing suits sold in spring tends to be:

• 50% less than the seasonal average

• 15% less than the seasonal average

• the same as the seasonal average

• 15% more than the seasonal average

• 50% more than the seasonal average

The seasonal indices for the number of bathing suits sold at a surf shop are given in the table.

To correct for seasonality, the actual number of bathing suits sold in Autumn should be:

• reduced by 60%

• reduced by 40%

• increased by 40%

• increased by 60%

• increased by 150%