Time Series

What is the 9 mean smooth for July?

• 127.6

• 135.3

• 133.5

• 211.4

What is the five point median smooth for month 5?

• 36

• 38

• 40

• 45

The seasonal index for winter is closest to

• 1.26

• 0.84

• 0.58

• 0.62

In 2021, the deseasonalised average maximum daily temperature in autumn was 22.2^oC. The actual average maximum daily temperature for autumn that year, was closest to

• 21.8

• 23.5

• 26.4

• 21.7

The table shows the weekly sales at a fast-food restaurant. Find the two mean smooth for Wednesday.

• 11261

• 11461

• 12179

• 12851

The table shows the number of umbrella sales in a store over a two year period. Find the seasonal index for autumn.

• 0.76

• 31.5

• 0.24

• 0.5

The umbrella sales for winter have a seasonal index of 1.26. Interpret this

• above average sales by 21%

• Above average sales by 26%

• Below average sales by 26%

• Below average sales by 21%

The umbrella sales for spring have a seasonal index of 0.92. What needs to be done to correct for seasonality?

• decrease by 92%

• increase by 8%

• increase 8.7%

• decrease 8%

The time series shows the number of credit card accounts held by Australians in 2023. Which of the following describes the trend?

• Seasonality only

• Seasonality with an increasing trend

• Irregular fluctuations only

• Decreasing trend with irregular fluctuations

The table shows the number of minutes Liv spent running over a period of time. Both a 3 pt and 5 pt smooth were completed. What day did they both have the same smoothed value?

• 4

• 5

• 6

• 7