The U.S. Geological Survey compiled historical data about Old Faithful Geyser (Y

Question

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 9560 observations, the sample mean interval was x1 = 63.8 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 23,000 observations, the sample mean time interval was x2 =69.0 minutes. Historical data suggest that 1 = 8.14 minutes and 2 = 12.34 minutes. Let 1 be the population mean of x1 and let 2 be the population mean of x2.

(a) Compute a 99% confidence interval for 1 – 2. (Use 2 decimal places.)

Explanation / Answer

The U.S. Geological Survey compiled historical data about Old Faithful Geyser (Y

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.