Question: Is Old Faithful Changing Over Time? Twelve different time intervals (in minutes) between eruptions of the Old Faithful geyser were recorded for each of the

Is Old Faithful Changing Over Time? Twelve different time intervals (in minutes)

between eruptions of the Old Faithful geyser were recorded for each of the years 1951, 1985, and 1996. (The data are from geologist Rick Hutchinson and the National Park Service.) When Minitab is used with the Kruskal-Wallis test, the results are as shown below. Do the different years have time intervals with identical populations?

Does it appear that the eruption behavior of Old Faithful is changing over time?

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