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 8820 observations, the sample mean interval was x1 = 62.2 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 25,340 observations, the sample mean time interval was x2 = 72.4 minutes. Historical data suggest that o = 9.47 minutes and o2 = 11.71 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 u1 - 42. (Use 2 decimal places.) |-10.04 X -10.279 X lower limit upper limit

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