Question: Consider the famous data set listing the time between eruptions of the geyser Old Faithful found at http://lib.stat.cmu.edu/DASL/Datafiles/differencetestdat .html from the article by A. Azzalini

Consider the famous data set listing the time between eruptions of the geyser “Old Faithful” found at http://lib.stat.cmu.edu/DASL/Datafiles/differencetestdat

.html from the article by A. Azzalini and A. W. Bowman,

“A Look at Some Data on the Old Faithful Geyser,”

Applied Statistics, Vol. 39, 1990, pp. 357–365.

(a) Construct a time series plot of all the data.

(b) Split the data into two data sets of 100 observations each. Create two separate stem-and-leaf plots of the subsets. Is there reason to believe that the two subsets are different?

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