Question
The U.S. Geological Survey compiled historical data about Old Faithful Geyser (Yellowstone National Park) from 1870 to 1987. Let x 1 be a random variable
The U.S. Geological Survey compiled historical data about Old Faithful Geyser (Yellowstone National Park) from 1870 to 1987. Letx1be a random variable that represents the time interval (in minutes) between Old Faithful eruptions for the years 1948 to 1952. Based on8960observations, the sample mean interval wasx1=64.2minutes. Letx2be a random variable that represents the time interval in minutes between Old Faithful eruptions for the years 1983 to 1987. Based on25,223observations, the sample mean time interval wasx2=72.8minutes. Historical data suggest that1=8.14minutes and2=12.41minutes. Let1be the population mean ofx1and let2be the population mean ofx2.
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