Given a data set with 20 yearly observations,there are only twelve 9-year moving averages.

Name: Given a data set with 20 yearly observations,there are only twelve 9-year moving averages.
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Question

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A 9-year moving average requires 9 consecutive data points to calculate each average. With 20 observations, the first moving average is calculated from observations 1 to 9, the second from 2 to 10, and so on, until the last one from 12 to 20, resulting in 12 moving averages.

Given a Data Set with 20 Yearly Observations,there Are Only