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QLDGeneral MathematicsQuick questions
Unit 3: Bivariate data, sequences and change, and Earth geometry
Quick questions on Time series analysis and smoothing (QCE General Mathematics Unit 3)
2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are smoothing with moving averages?Show answer
A moving average replaces each value with the average of itself and its neighbours, smoothing out irregular variation to reveal the trend. For an odd number of points (for example a -point or -point moving average) the smoothed value lines up directly with the middle time period.
What is indices that do not sum correctly?Show answer
Quarterly indices must sum to and monthly indices to . If they do not, they have been computed wrongly and every later step inherits the error.
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