# Is the data set approximately periodic? if so, what are it’s period and amplitude?

A ploto of the data seems to show it has two periods of variation. On is about length 12, and the other is about length 2. Thus it is hard to say the data is "not periodic." Of the choices offered, the best correlation is with the last one:   periodic with a period of 12 and an amplitude of about 12.5

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