FILE Consider the following monthly observations for 5 years. The data are also on the text website,

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FILE Consider the following monthly observations for 5 years. The data are also on the text website, labeled Exercise 18.21.

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 1 13 17 15 12 32 15 21 17 33 15 34 21 2 26 10 14 19 17 14 27 30 25 15 18 27 3 24 11 19 23 19 18 31 18 15 31 34 27 4 23 22 17 24 17 24 15 19 33 19 16 39 5 17 19 25 30 18 17 19 36 19 26 21 35

a. Calculate the 12-month centered moving average.

b. Calculate the ratio-to-moving average.

c. Calculate and interpret the seasonal indices for April and November.

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Business Statistics Communicating With Numbers

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FILE Consider the following monthly observations for 5 years. The data are also on the text website,

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Business Statistics Communicating With Numbers

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