Interactive practice questions
Choose the correct option to fill in the blank in each case.
A seasonal index greater than $1.0$1.0 means that the raw data is __________ than average.
higher
lower
A seasonal index less than $1.0$1.0 means that the raw data is __________ than average.
higher
lower
To deseasonalise raw data you must ______________ by the seasonal index.
multiply
divide
To convert a deseasonalised figure to the raw data figure you must ____________ by the seasonal index.
multiply
divide
On a time series graph a ‘peak’ corresponds to the season with the _________ seasonal index.
highest
lowest
Choose the correct option to fill in the blank in each case.
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.
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.