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The U.S. Geological Survey compiled historical data about Old Faithful Geyser (Yellowstone National Park) from 1870...

The U.S. Geological Survey compiled historical data about Old Faithful Geyser (Yellowstone National Park) from 1870 to 1987. Let x1 be a random variable that represents the time interval (in minutes) between Old Faithful eruptions for the years 1948 to 1952. Based on 9160 observations, the sample mean interval was x1 = 61.8 minutes. Let x2 be a random variable that represents the time interval in minutes between Old Faithful eruptions for the years 1983 to 1987. Based on 23,351 observations, the sample mean time interval was x2 = 72.8 minutes. Historical data suggest that σ1 = 9.19 minutes and σ2 = 11.50 minutes. Let μ1 be the population mean of x1 and let μ2 be the population mean of x2. (a) Compute a 95% confidence interval for μ1 – μ2. (Use 2 decimal places.) lower limit upper limit

(a) Compute a 95% confidence interval for μ1 – μ2. (Use 2 decimal places.)

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