The US Geological Survey complied historical data about Old Faithful Geyser from 1870 to 1987. Let x1 be a random variable that represents the time interval (in minutes) between Old Faithful eruptions for the years 1949 to 1952. Based on 8840 observations, the sample mean interval was x1=65.0 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 in 24404 observations the sample mean time interval was x2=71.2 minutes. Historical data suggest that o1= 8.14 minutes and o2= 11.78 minutes. Let u1 be the population mean of x1 and let u2 be the population mean of x2. Compute a 95% confidence interval for u1-u2.(use 2 decimal places) lower limit= upper limit=
The US Geological Survey complied historical data about Old Faithful Geyser from 1870 to 1987. Let x1 be a random variable that represents the time interval (in minutes) between Old Faithful eruptions for the years 1949 to 1952. Based on 8840 observations, the sample mean interval was x1=65.0 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 in 24404 observations the sample mean time interval was x2=71.2 minutes. Historical data suggest that o1= 8.14 minutes and o2= 11.78 minutes. Let u1 be the population mean of x1 and let u2 be the population mean of x2.
Compute a 95% confidence interval for u1-u2.(use 2 decimal places)
lower limit=
upper limit=
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