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QUESTION 24 (3 marks) The population of fish in a fish farm pond was recorded every three months. The graph shows the data. 1400 1200 1000 800 600 Population of fish 400 200 0 4 8 12 16 Quarters Describe the time series plot by identifying three key features.
QUESTION 3 The table shows the minimum and maximum temperatures on January 1 each year in Bundaberg. (A) ©) Temperature (°C) Temperature (°C) N N 24 23 22 21 2017 2018 2019 2020 2021 Year 2017 2018 2019 2020 2021 Year (B) (D) Which time series plot best represents the mean temperatures? Temperature (°C) Temperature (°C) 33 U DN 31 30 29 28 2017 2018 2019 2020 2021 Year 2017 2018 2019 2020 2021 Year
QUESTION 19 (4 marks) The graph shows the amount of rainfall (in mm) for each quarter from 2016 to 2021. 250 200 e g = 150 g s (2 o = 100 o £ < 50 O i | | | i ' | i | | | | | i | | | i 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 | | | ] L 1 2016 2017 2018 2019 2020 2021 Quarters (each year) a) Describe the long-term trend and seasonality of the time series data. [2 marks] b) A least-squares line was fitted to the data with y representing the amount of rainfall and x representing the number of quarters since the beginning of 2016 (e.g. x = 5 for the first quarter of 2017). y=1.763x+ 156.5 Interpret the y-intercept and slope of the fitted line. [2 marks]
QUESTION 2 A time series plot is shown. Profit ($’000) oO 0 2 + 6 8 10 12 14 16 Time (years) It could best be described as (A) cyclical. (B) seasonal. (C) irregular. (D) increasing.
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