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5.03 Seasonal adjustments and deseasonalising data

Interactive practice questions

Choose the correct option to fill in the blank in each case.

a

A seasonal index greater than $1.0$1.0 means that the raw data is __________ than average.

higher

A

lower

B
b

A seasonal index less than $1.0$1.0 means that the raw data is __________ than average.

higher

A

lower

B
c

To deseasonalise raw data you must ______________ by the seasonal index.

multiply

A

divide

B
d

To convert a deseasonalised figure to the raw data figure you must ____________ by the seasonal index.

multiply

A

divide

B
e

On a time series graph a ‘peak’ corresponds to the season with the _________ seasonal index.

highest

A

lowest

B
Easy
1min

Choose the correct option to fill in the blank in each case.

Easy
< 1min

A petrol store owner records the number of cars visiting the station each day for a number of weeks. The seasonal indices for each day are displayed in the table below.

Easy
3min

The number of customers for an online food delivery service is recorded in groups of $4$4 months. The seasonal indices calculated as a percentage are displayed in the table below.

Easy
4min
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Outcomes

4.1.4

calculate seasonal indices by using the average percentage method

4.1.5

deseasonalise a time series by using a seasonal index, including the use of spreadsheets to implement this process

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